Fix issue that could cause config loader to fail if no block given to a subvm
Fix issue that could cause config loader to fail if no block given to a subvm

PatOShea/vagrant,petems/vagrant,channui/vagrant,otagi/vagrant,MiLk/vagrant,wangfakang/vagrant,mitchellh/vagrant,mitchellh/vagrant,myrjola/vagrant,genome21/vagrant,invernizzi-at-google/vagrant,rivy/vagrant,PatrickLang/vagrant,tomfanning/vagrant,teotihuacanada/vagrant,apertoso/vagrant,Endika/vagrant,ianmiell/vagrant,h4ck3rm1k3/vagrant,miguel250/vagrant,jmanero/vagrant,iNecas/vagrant,nickryand/vagrant,jmanero/vagrant,Endika/vagrant,bryson/vagrant,bdwyertech/vagrant,apertoso/vagrant,obnoxxx/vagrant,carlosefr/vagrant,theist/vagrant,chrisvire/vagrant,jean/vagrant,bryson/vagrant,jtopper/vagrant,mwrock/vagrant,genome21/vagrant,ianmiell/vagrant,aneeshusa/vagrant,stephancom/vagrant,ferventcoder/vagrant,tknerr/vagrant,bshurts/vagrant,juiceinc/vagrant,pwnall/vagrant,marxarelli/vagrant,modulexcite/vagrant,jfchevrette/vagrant,lonniev/vagrant,clinstid/vagrant,jhoblitt/vagrant,crashlytics/vagrant,jfchevrette/vagrant,muhanadra/vagrant,jberends/vagrant,justincampbell/vagrant,krig/vagrant,signed8bit/vagrant,tschortsch/vagrant,mwarren/vagrant,stephancom/vagrant,loren-osborn/vagrant,shtouff/vagrant,blueyed/vagrant,muhanadra/vagrant,taliesins/vagrant,mpoeter/vagrant,tjanez/vagrant,wkolean/vagrant,Ninir/vagrant,msabramo/vagrant,jberends/vagrant,mwarren/vagrant,benizi/vagrant,Chhed13/vagrant,Chhed13/vagrant,benizi/vagrant,jtopper/vagrant,obnoxxx/vagrant,darkn3rd/vagrant,carlosefr/vagrant,jtopper/vagrant,loren-osborn/vagrant,legal90/vagrant,legal90/vagrant,philoserf/vagrant,dhoer/vagrant,kamigerami/vagrant,gajdaw/vagrant,aneeshusa/vagrant,otagi/vagrant,Endika/vagrant,modulexcite/vagrant,mephaust/vagrant,blueyed/vagrant,modulexcite/vagrant,doy/vagrant,PatOShea/vagrant,bmhatfield/vagrant,sferik/vagrant,gitebra/vagrant,jean/vagrant,marxarelli/vagrant,dustymabe/vagrant,obnoxxx/vagrant,myrjola/vagrant,iNecas/vagrant,benh57/vagrant,jean/vagrant,sideci-sample/sideci-sample-vagrant,wangfakang/vagrant,janek-warchol/vagrant,ArloL/vagrant,cgvarela/vagrant,vamegh/vagrant,TheBigBear/vagrant,PatOShea/vagrant,philwrenn/vagrant,h4ck3rm1k3/vagrant,zsjohny/vagrant,benh57/vagrant,kamazee/vagrant,cgvarela/vagrant,benh57/vagrant,miguel250/vagrant,justincampbell/vagrant,jkburges/vagrant,tschortsch/vagrant,webcoyote/vagrant,mkuzmin/vagrant,krig/vagrant,PatrickLang/vagrant,aaam/vagrant,chrisroberts/vagrant,BlakeMesdag/vagrant,gbarberi/vagrant,jkburges/vagrant,pwnall/vagrant,myrjola/vagrant,sni/vagrant,jkburges/vagrant,doy/vagrant,teotihuacanada/vagrant,blueyed/vagrant,gitebra/vagrant,tbarrongh/vagrant,petems/vagrant,gitebra/vagrant,fnewberg/vagrant,nickryand/vagrant,invernizzi-at-google/vagrant,dustymabe/vagrant,patrys/vagrant,senglin/vagrant,aaam/vagrant,stephancom/vagrant,justincampbell/vagrant,tjanez/vagrant,genome21/vagrant,legal90/vagrant,otagi/vagrant,sax/vagrant,aneeshusa/vagrant,mephaust/vagrant,gbarberi/vagrant,philoserf/vagrant,tbriggs-curse/vagrant,Endika/vagrant,crashlytics/vagrant,clinstid/vagrant,justincampbell/vagrant,stephancom/vagrant,chrisvire/vagrant,kalabiyau/vagrant,MiLk/vagrant,ianmiell/vagrant,carlosefr/vagrant,loren-osborn/vagrant,samphippen/vagrant,rivy/vagrant,mwarren/vagrant,taliesins/vagrant,evverx/vagrant,mkuzmin/vagrant,sni/vagrant,lukebakken/vagrant,kamigerami/vagrant,TheBigBear/vagrant,wkolean/vagrant,jberends/vagrant,tbarrongh/vagrant,p0deje/vagrant,cgvarela/vagrant,modulexcite/vagrant,kamazee/vagrant,p0deje/vagrant,johntron/vagrant,theist/vagrant,dharmab/vagrant,bheuvel/vagrant,bheuvel/vagrant,legal90/vagrant,glensc/vagrant,kalabiyau/vagrant,denisbr/vagrant,jhoblitt/vagrant,ianmiell/vagrant,benizi/vagrant,philoserf/vagrant,krig/vagrant,dustymabe/vagrant,juiceinc/vagrant,mwarren/vagrant,sni/vagrant,darkn3rd/vagrant,vamegh/vagrant,wkolean/vagrant,mkuzmin/vagrant,dharmab/vagrant,jfchevrette/vagrant,bryson/vagrant,gitebra/vagrant,cgvarela/vagrant,johntron/vagrant,bdwyertech/vagrant,patrys/vagrant,senglin/vagrant,mephaust/vagrant,mitchellh/vagrant,Avira/vagrant,jhoblitt/vagrant,TheBigBear/vagrant,tjanez/vagrant,janek-warchol/vagrant,msabramo/vagrant,lonniev/vagrant,vamegh/vagrant,tschortsch/vagrant,loren-osborn/vagrant,aaam/vagrant,gpkfr/vagrant,crashlytics/vagrant,chrisvire/vagrant,bshurts/vagrant,lukebakken/vagrant,marxarelli/vagrant,chrisvire/vagrant,gajdaw/vagrant,ArloL/vagrant,kalabiyau/vagrant,mwrock/vagrant,ferventcoder/vagrant,Sgoettschkes/vagrant,zsjohny/vagrant,Chhed13/vagrant,dharmab/vagrant,tjanez/vagrant,Avira/vagrant,lukebakken/vagrant,h4ck3rm1k3/vagrant,sax/vagrant,bmhatfield/vagrant,tomfanning/vagrant,johntron/vagrant,petems/vagrant,rivy/vagrant,tbarrongh/vagrant,ferventcoder/vagrant,bdwyertech/vagrant,patrys/vagrant,kamazee/vagrant,darkn3rd/vagrant,signed8bit/vagrant,BlakeMesdag/vagrant,sax/vagrant,zsjohny/vagrant,bmhatfield/vagrant,tbarrongh/vagrant,apertoso/vagrant,juiceinc/vagrant,rivy/vagrant,myrjola/vagrant,mpoeter/vagrant,gpkfr/vagrant,clinstid/vagrant,evverx/vagrant,evverx/vagrant,signed8bit/vagrant,Chhunlong/vagrant,kamigerami/vagrant,taliesins/vagrant,taliesins/vagrant,johntron/vagrant,mitchellh/vagrant,gajdaw/vagrant,chrisroberts/vagrant,pwnall/vagrant,chrisroberts/vagrant,sni/vagrant,jberends/vagrant,mephaust/vagrant,wkolean/vagrant,dharmab/vagrant,doy/vagrant,samphippen/vagrant,invernizzi-at-google/vagrant,marxarelli/vagrant,crashlytics/vagrant,shtouff/vagrant,mwrock/vagrant,aaam/vagrant,Chhunlong/vagrant,bdwyertech/vagrant,dustymabe/vagrant,Ninir/vagrant,PatOShea/vagrant,jean/vagrant,Sgoettschkes/vagrant,bshurts/vagrant,pwnall/vagrant,bryson/vagrant,mwrock/vagrant,invernizzi-at-google/vagrant,bheuvel/vagrant,sax/vagrant,mpoeter/vagrant,glensc/vagrant,msabramo/vagrant,blueyed/vagrant,tknerr/vagrant,channui/vagrant,mpoeter/vagrant,TheBigBear/vagrant,ferventcoder/vagrant,gbarberi/vagrant,miguel250/vagrant,sideci-sample/sideci-sample-vagrant,Sgoettschkes/vagrant,senglin/vagrant,mkuzmin/vagrant,aneeshusa/vagrant,lonniev/vagrant,kamigerami/vagrant,shtouff/vagrant,muhanadra/vagrant,iNecas/vagrant,benizi/vagrant,philwrenn/vagrant,zsjohny/vagrant,senglin/vagrant,tomfanning/vagrant,dhoer/vagrant,dhoer/vagrant,tknerr/vagrant,jmanero/vagrant,nickryand/vagrant,krig/vagrant,PatrickLang/vagrant,theist/vagrant,samphippen/vagrant,msabramo/vagrant,PatrickLang/vagrant,fnewberg/vagrant,webcoyote/vagrant,p0deje/vagrant,juiceinc/vagrant,philwrenn/vagrant,denisbr/vagrant,jmanero/vagrant,kalabiyau/vagrant,Avira/vagrant,lukebakken/vagrant,wangfakang/vagrant,wangfakang/vagrant,fnewberg/vagrant,apertoso/vagrant,MiLk/vagrant,chrisroberts/vagrant,sferik/vagrant,fnewberg/vagrant,dhoer/vagrant,Ninir/vagrant,BlakeMesdag/vagrant,tbriggs-curse/vagrant,nickryand/vagrant,benh57/vagrant,doy/vagrant,teotihuacanada/vagrant,philoserf/vagrant,jfchevrette/vagrant,Chhunlong/vagrant,carlosefr/vagrant,vamegh/vagrant,webcoyote/vagrant,theist/vagrant,janek-warchol/vagrant,jhoblitt/vagrant,Chhed13/vagrant,tbriggs-curse/vagrant,tbriggs-curse/vagrant,sferik/vagrant,darkn3rd/vagrant,jtopper/vagrant,shtouff/vagrant,genome21/vagrant,bshurts/vagrant,teotihuacanada/vagrant,Chhunlong/vagrant,ArloL/vagrant,gbarberi/vagrant,webcoyote/vagrant,lonniev/vagrant,patrys/vagrant,kamazee/vagrant,Avira/vagrant,tknerr/vagrant,gpkfr/vagrant,denisbr/vagrant,signed8bit/vagrant,jkburges/vagrant,sideci-sample/sideci-sample-vagrant,tomfanning/vagrant,petems/vagrant,channui/vagrant,muhanadra/vagrant,denisbr/vagrant,Sgoettschkes/vagrant,samphippen/vagrant,bheuvel/vagrant,philwrenn/vagrant,janek-warchol/vagrant,tschortsch/vagrant,gpkfr/vagrant,miguel250/vagrant,ArloL/vagrant,h4ck3rm1k3/vagrant,otagi/vagrant