build(broccoli-typescript): check for map files before deleting them
build(broccoli-typescript): check for map files before deleting them

fixes #5610
Closes #6065

chrisse27/angular,jteplitz602/angular,tbosch/angular,bkyarger/angular,IdeaBlade/angular,alamgird/angular,kylecordes/angular,shuhei/angular,youdz/angular,cironunes/angular,hpinsley/angular,royling/angular,angularbrasil/angular,robwormald/angular,willseeyou/angular,dydek/angular,robwormald/angular,gkalpak/angular,hterkelsen/angular,mhevery/angular,laco0416/angular,dtoroshin/n2oDoc,kylecordes/angular,matsko/angular,not-for-me/angular,ocombe/angular,diestrin/angular,tycho01/angular,filipesilva/angular,ocombe/angular,huoxudong125/angular,JanStureNielsen/angular,NathanWalker/angular,jhonmike/angular,gdi2290/angular,alxhub/angular,tolemac/angular,angular-indonesia/angular,rbevers/angular,dsebastien/angular,vikerman/angular,graveto/angular,itamark/angular,e-schultz/angular,vikerman/angular,ochafik/angular,rkirov/angular,petebacondarwin/angular,e-schultz/angular,mgiambalvo/angular,Flounn/angular,JiaLiPassion/angular,kevinmerckx/angular,templth/angular,alfonso-presa/angular,basvandenheuvel/angular,hterkelsen/angular,mhegazy/angular,kegluneq/angular,martinmcwhorter/angular,mgol/angular,Brocco/angular,naomiblack/angular,dsebastien/angular,zhura/angular,dejour/angular,wKoza/angular,jteplitz602/angular,ochafik/angular,tbosch/angular,heathkit/angular,laskoviymishka/angular,royling/angular,tyleranton/angular,ultrasonicsoft/angular,mgol/angular,hannahhoward/angular,vikerman/angular,rbevers/angular,NathanWalker/angular,ollie314/angular,sarunint/angular,jhonmike/angular,SaltyDH/angular,ValtoFrameworks/Angular-2,cironunes/angular,brandonroberts/angular,ScottSWu/angular,alexpods/angular,chrisse27/angular,angular-indonesia/angular,zhura/angular,chrisse27/angular,JSMike/angular,NathanWalker/angular,jasonaden/angular,chrisse27/angular,GistIcon/angular,hansl/angular,alexeagle/angular,graveto/angular,jesperronn/angular,gionkunz/angular,souldreamer/angular,graveto/angular,robwormald/angular,martinmcwhorter/angular,sarunint/angular,ollie314/angular,Toxicable/angular,youdz/angular,manekinekko/angular,robertmesserle/angular,mlaval/angular,zhura/angular,UIUXEngineering-Forks/angular,dmitriz/angular,JiaLiPassion/angular,antonmoiseev/angular,angular/angular,xcaliber-tech/angular,Mathou54/angular,jesperronn/angular,diestrin/angular,IgorMinar/angular,panuruj/angular,kara/angular,mzgol/angular,vsavkin/angular,aboveyou00/angular,Symagic/angular,smartm0use/angular,choeller/angular,rbevers/angular,asnowwolf/angular,vamsivarikuti/angular,dydek/angular,alexeagle/angular,erictsangx/angular,JSMike/angular,hpinsley/angular,AlmogShaul/angular,blesh/angular,angular-indonesia/angular,JanStureNielsen/angular,kara/angular,rkirov/angular,rkirov/angular,hansl/angular,aboveyou00/angular,juleskremer/angular,cassand/angular,tycho01/angular,micmro/angular,IgorMinar/angular,jasonaden/angular,sjtrimble/angular,kara/angular,tamascsaba/angular,mprobst/angular,ochafik/angular,cironunes/angular,not-for-me/angular,shairez/angular,basvandenheuvel/angular,GistIcon/angular,shirish87/angular,angularbrasil/angular,SekibOmazic/angular,itamark/angular,dydek/angular,jteplitz602/angular,youdz/angular,alamgird/angular,trshafer/angular,vikerman/angular,hterkelsen/angular,sarunint/angular,IgorMinar/angular,vandres/angular,snaptech/angular,chalin/angular,hannahhoward/angular,Flounn/angular,ollie314/angular,manekinekko/angular,tyleranton/angular,mhevery/angular,juristr/angular,vsavkin/angular,nosovk/angular,laco0416/angular,choeller/angular,kara/angular,shirish87/angular,e-schultz/angular,chajath/angular,hpinsley/angular,shirish87/angular,vsavkin/angular,petebacondarwin/angular,trshafer/angular,tamascsaba/angular,UIUXEngineering/angular,Symagic/angular,blesh/angular,asnowwolf/angular,jasonaden/angular,micmro/angular,trshafer/angular,Brocco/angular,Symagic/angular,IgorMinar/angular,mgiambalvo/angular,juleskremer/angular,mgiambalvo/angular,kevinmerckx/angular,heathkit/angular,mhegazy/angular,chajath/angular,souldreamer/angular,mlaval/angular,Symagic/angular,shuhei/angular,petebacondarwin/angular,shairez/angular,juristr/angular,Toxicable/angular,SaltyDH/angular,JanStureNielsen/angular,shirish87/angular,nosovk/angular,huoxudong125/angular,cironunes/angular,blesh/angular,angularbrasil/angular,kevinmerckx/angular,souldreamer/angular,heathkit/angular,ultrasonicsoft/angular,dsebastien/angular,NathanWalker/angular,kwalrath/angular,gionkunz/angular,alfonso-presa/angular,vicb/angular,IgorMinar/angular,dejour/angular,matsko/angular,tbosch/angular,ultrasonicsoft/angular,alamgird/angular,jteplitz602/angular,gnomeontherun/angular,jteplitz602/angular,gjungb/angular,ultrasonicsoft/angular,robertmesserle/angular,Brocco/angular,cassand/angular,gjungb/angular,angularbrasil/angular,chuckjaz/angular,gkalpak/angular,juristr/angular,jonrimmer/angular,dmitriz/angular,hpinsley/angular,ocombe/angular,alexcastillo/angular,rjamet/angular,mprobst/angular,tamascsaba/angular,kegluneq/angular,robertmesserle/angular,hpinsley/angular,mikeybyker/angular,cironunes/angular,mgechev/angular,robwormald/angular,nosovk/angular,juristr/angular,StephenFluin/angular,kevinmerckx/angular,tolemac/angular,jteplitz602/angular,naomiblack/angular,tolemac/angular,youdz/angular,meeroslav/angular,GistIcon/angular,chrisse27/angular,vandres/angular,Symagic/angular,SaltyDH/angular,mhegazy/angular,mikeybyker/angular,e-schultz/angular,vinagreti/angular,jesperronn/angular,templth/angular,antonmoiseev/angular,UIUXEngineering/angular,bkyarger/angular,hdeshev/angular,bkyarger/angular,Brocco/angular,alfonso-presa/angular,souldreamer/angular,kevinmerckx/angular,erictsangx/angular,Brocco/angular,pk-karthik/framework-js-angular,UIUXEngineering-Forks/angular,ericmartinezr/angular,e-hein/angular,sarunint/angular,gionkunz/angular,itamark/angular,IdeaBlade/angular,vikerman/angular,gdi2290/angular,alexpods/angular,ochafik/angular,vicb/angular,robertmesserle/angular,ochafik/angular,e-schultz/angular,angular-indonesia/angular,ocombe/angular,rkirov/angular,trshafer/angular,xcaliber-tech/angular,gdi2290/angular,dtoroshin/n2oDoc,Symagic/angular,nosovk/angular,basvandenheuvel/angular,vicb/angular,AlmogShaul/angular,hansl/angular,GistIcon/angular,ScottSWu/angular,aboveyou00/angular,rjamet/angular,alexpods/angular,dydek/angular,cexbrayat/angular,pk-karthik/framework-js-angular,chuckjaz/angular,vinagreti/angular,mgechev/angular,dmitriz/angular,cexbrayat/angular,ericmartinezr/angular,alfonso-presa/angular,Flounn/angular,shairez/angular,manekinekko/angular,mgechev/angular,micmro/angular,kylecordes/angular,manekinekko/angular,SaltyDH/angular,tycho01/angular,pkozlowski-opensource/angular,wKoza/angular,chajath/angular,wKoza/angular,antonmoiseev/angular,xcaliber-tech/angular,mgol/angular,mzgol/angular,jasonaden/angular,gkalpak/angular,LucasSloan/angular,pkozlowski-opensource/angular,ghetolay/angular,souvikbasu/angular,mprobst/angular,cassand/angular,SaltyDH/angular,gjungb/angular,sjtrimble/angular,ultrasonicsoft/angular,angular/angular,mlaval/angular,chuckjaz/angular,juleskremer/angular,JiaLiPassion/angular,panuruj/angular,mhevery/angular,ValtoFrameworks/Angular-2,JSMike/angular,hpinsley/angular,sjtrimble/angular,Toxicable/angular,micmro/angular,mhegazy/angular,mikeybyker/angular,bkyarger/angular,mprobst/angular,awerlang/angular,kegluneq/angular,Mathou54/angular,templth/angular,mhegazy/angular,mdegoo/angular,manekinekko/angular,ScottSWu/angular,ultrasonicsoft/angular,kwalrath/angular,ericmartinezr/angular,rjamet/angular,mgol/angular,UIUXEngineering/angular,tamascsaba/angular,robwormald/angular,StephenFluin/angular,vandres/angular,vamsivarikuti/angular,awerlang/angular,LucasSloan/angular,laskoviymishka/angular,ghetolay/angular,gkalpak/angular,souvikbasu/angular,huoxudong125/angular,chuckjaz/angular,pk-karthik/framework-js-angular,hterkelsen/angular,mzgol/angular,petebacondarwin/angular,basvandenheuvel/angular,shuhei/angular,kegluneq/angular,chajath/angular,smartm0use/angular,gdi2290/angular,cexbrayat/angular,domusofsail/angular,vamsivarikuti/angular,brandonroberts/angular,UIUXEngineering/angular,vikerman/angular,meeroslav/angular,e-hein/angular,tycho01/angular,mgechev/angular,dejour/angular,antonmoiseev/angular,shuhei/angular,smartm0use/angular,antonmoiseev/angular,UIUXEngineering-Forks/angular,rkirov/angular,wKoza/angular,heathkit/angular,asnowwolf/angular,tamascsaba/angular,alamgird/angular,dsebastien/angular,snaptech/angular,sjtrimble/angular,alexcastillo/angular,gnomeontherun/angular,alfonso-presa/angular,graveto/angular,Mathou54/angular,hannahhoward/angular,erictsangx/angular,ScottSWu/angular,mprobst/angular,vandres/angular,mdegoo/angular,juleskremer/angular,alxhub/angular,Toxicable/angular,matsko/angular,choeller/angular,vsavkin/angular,tbosch/angular,domusofsail/angular,erictsangx/angular,mhevery/angular,choeller/angular,souvikbasu/angular,snaptech/angular,willseeyou/angular,templth/angular,snaptech/angular,royling/angular,laco0416/angular,alexeagle/angular,blesh/angular,meeroslav/angular,UIUXEngineering-Forks/angular,GistIcon/angular,dmitriz/angular,vinagreti/angular,mlaval/angular,jasonaden/angular,awerlang/angular,hannahhoward/angular,diestrin/angular,SekibOmazic/angular,chuckjaz/angular,e-schultz/angular,Mathou54/angular,sarunint/angular,kwalrath/angular,blesh/angular,mzgol/angular,tyleranton/angular,naomiblack/angular,robwormald/angular,alxhub/angular,itamark/angular,willseeyou/angular,ericmartinezr/angular,hdeshev/angular,jonrimmer/angular,rjamet/angular,hdeshev/angular,ghetolay/angular,hdeshev/angular,juristr/angular,NathanWalker/angular,souldreamer/angular,vinagreti/angular,jonrimmer/angular,kylecordes/angular,mzgol/angular,souvikbasu/angular,kylecordes/angular,mikeybyker/angular,zhura/angular,chalin/angular,royling/angular,mgechev/angular,pk-karthik/framework-js-angular,JSMike/angular,laskoviymishka/angular,ValtoFrameworks/Angular-2,alexcastillo/angular,StephenFluin/angular,ericmartinezr/angular,awerlang/angular,naomiblack/angular,hansl/angular,mdegoo/angular,wKoza/angular,angular/angular,tycho01/angular,alexeagle/angular,tolemac/angular,snaptech/angular,laskoviymishka/angular,e-hein/angular,dtoroshin/n2oDoc,LucasSloan/angular,alexcastillo/angular,AlmogShaul/angular,tolemac/angular,IgorMinar/angular,alexpods/angular,jonrimmer/angular,manekinekko/angular,shairez/angular,mdegoo/angular,AlmogShaul/angular,vandres/angular,gjungb/angular,brandonroberts/angular,trshafer/angular,xcaliber-tech/angular,choeller/angular,gnomeontherun/angular,UIUXEngineering-Forks/angular,ocombe/angular,hannahhoward/angular,ericmartinezr/angular,SekibOmazic/angular,dsebastien/angular,shuhei/angular,sjtrimble/angular,robertmesserle/angular,snaptech/angular,IdeaBlade/angular,brandonroberts/angular,chalin/angular,kara/angular,cassand/angular,hterkelsen/angular,ollie314/angular,tamascsaba/angular,hdeshev/angular,chalin/angular,cexbrayat/angular,Toxicable/angular,JSMike/angular,ocombe/angular,JiaLiPassion/angular,JanStureNielsen/angular,diestrin/angular,souldreamer/angular,choeller/angular,laskoviymishka/angular,xcaliber-tech/angular,ValtoFrameworks/Angular-2,alexcastillo/angular,templth/angular,jhonmike/angular,domusofsail/angular,tyleranton/angular,willseeyou/angular,jhonmike/angular,sarunint/angular,dtoroshin/n2oDoc,LucasSloan/angular,souvikbasu/angular,ollie314/angular,alexpods/angular,hdeshev/angular,tbosch/angular,shirish87/angular,heathkit/angular,alxhub/angular,petebacondarwin/angular,willseeyou/angular,mgol/angular,asnowwolf/angular,mikeybyker/angular,dsebastien/angular,jesperronn/angular,gdi2290/angular,kegluneq/angular,aboveyou00/angular,gdi2290/angular,AlmogShaul/angular,itamark/angular,IdeaBlade/angular,NathanWalker/angular,smartm0use/angular,jonrimmer/angular,GistIcon/angular,angularbrasil/angular,micmro/angular,cironunes/angular,graveto/angular,antonmoiseev/angular,shuhei/angular,dmitriz/angular,e-hein/angular,huoxudong125/angular,rkirov/angular,kara/angular,pk-karthik/framework-js-angular,UIUXEngineering/angular,Mathou54/angular,youdz/angular,rbevers/angular,vinagreti/angular,laco0416/angular,gnomeontherun/angular,cexbrayat/angular,pkozlowski-opensource/angular,gionkunz/angular,vicb/angular,Flounn/angular,pkozlowski-opensource/angular,asnowwolf/angular,alexeagle/angular,SekibOmazic/angular,martinmcwhorter/angular,filipesilva/angular,dmitriz/angular,mdegoo/angular,graveto/angular,cassand/angular,aboveyou00/angular,matsko/angular,jonrimmer/angular,gionkunz/angular,jasonaden/angular,dydek/angular,gionkunz/angular,vamsivarikuti/angular,vicb/angular,huoxudong125/angular,alfonso-presa/angular,ochafik/angular,ScottSWu/angular,rbevers/angular,mgiambalvo/angular,petebacondarwin/angular,kevinmerckx/angular,chajath/angular,tyleranton/angular,vicb/angular,alexcastillo/angular,Toxicable/angular,panuruj/angular,LucasSloan/angular,willseeyou/angular,hansl/angular,vsavkin/angular,rbevers/angular,mlaval/angular,jhonmike/angular,huoxudong125/angular,angularbrasil/angular,panuruj/angular,martinmcwhorter/angular,panuruj/angular,robertmesserle/angular,zhura/angular,laco0416/angular,filipesilva/angular,mhevery/angular,micmro/angular,pkozlowski-opensource/angular,mhevery/angular,SekibOmazic/angular,tolemac/angular,shirish87/angular,Brocco/angular,martinmcwhorter/angular,alexeagle/angular,heathkit/angular,LucasSloan/angular,erictsangx/angular,bkyarger/angular,brandonroberts/angular,naomiblack/angular,jesperronn/angular,mgol/angular,dejour/angular,hterkelsen/angular,filipesilva/angular,smartm0use/angular,kegluneq/angular,shairez/angular,juleskremer/angular,bkyarger/angular,not-for-me/angular,kylecordes/angular,meeroslav/angular,royling/angular,UIUXEngineering-Forks/angular,gjungb/angular,alexpods/angular,awerlang/angular,ghetolay/angular,kwalrath/angular,SekibOmazic/angular,alamgird/angular,not-for-me/angular,basvandenheuvel/angular,filipesilva/angular,zhura/angular,ValtoFrameworks/Angular-2,angular/angular,nosovk/angular,chuckjaz/angular,tycho01/angular,martinmcwhorter/angular,aboveyou00/angular,domusofsail/angular,mgiambalvo/angular,youdz/angular,tyleranton/angular,Flounn/angular,mdegoo/angular,hansl/angular,trshafer/angular,meeroslav/angular,StephenFluin/angular,dtoroshin/n2oDoc,dejour/angular,brandonroberts/angular,basvandenheuvel/angular,domusofsail/angular,JanStureNielsen/angular,laco0416/angular,not-for-me/angular,IdeaBlade/angular,jhonmike/angular,matsko/angular,erictsangx/angular,kwalrath/angular,wKoza/angular,alxhub/angular,hannahhoward/angular,e-hein/angular,ghetolay/angular,StephenFluin/angular,juristr/angular,ScottSWu/angular,mzgol/angular,mprobst/angular,cassand/angular,vamsivarikuti/angular,mhegazy/angular