Emit a friendly error when fig.yml is missing
Emit a friendly error when fig.yml is missing

I keep doing this by accident, so I'd rather not see the stack trace.

mnuessler/compose,moxiegirl/compose,KalleDK/compose,troy0820/docker.github.io,jessekl/compose,bcicen/fig,prologic/compose,londoncalling/docker.github.io,mindaugasrukas/compose,Dakno/compose,docker-zh/docker.github.io,funkyfuture/docker-compose,Katlean/fig,londoncalling/docker.github.io,sanscontext/docker.github.io,noironetworks/compose,gdevillele/docker.github.io,zhangspook/compose,aanand/fig,denverdino/docker.github.io,johnstep/docker.github.io,tiry/compose,mindaugasrukas/compose,JimGalasyn/docker.github.io,ChrisChinchilla/compose,denverdino/denverdino.github.io,alunduil/fig,LuisBosquez/docker.github.io,mchasal/compose,joeuo/docker.github.io,alexisbellido/docker.github.io,danix800/docker.github.io,denverdino/compose,jzwlqx/denverdino.github.io,RobertNorthard/compose,nerro/compose,thaJeztah/docker.github.io,cclauss/compose,Yelp/docker-compose,thieman/compose,albers/compose,dopry/compose,mohitsoni/compose,albers/compose,londoncalling/docker.github.io,BSWANG/denverdino.github.io,joeuo/docker.github.io,anweiss/docker.github.io,brunocascio/compose,shubheksha/docker.github.io,LuisBosquez/docker.github.io,ekristen/compose,jorgeLuizChaves/compose,gdevillele/docker.github.io,michael-k/docker-compose,xydinesh/compose,JimGalasyn/docker.github.io,ChrisChinchilla/compose,rillig/docker.github.io,qzio/compose,twitherspoon/compose,philwrenn/compose,denverdino/denverdino.github.io,kojiromike/compose,cgvarela/compose,JimGalasyn/docker.github.io,JimGalasyn/docker.github.io,d2bit/compose,jgrowl/compose,unodba/compose,Yelp/docker-compose,viranch/compose,dbdd4us/compose,menglingwei/denverdino.github.io,thaJeztah/docker.github.io,alexandrev/compose,mrfuxi/compose,j-fuentes/compose,lmesz/compose,bdwill/docker.github.io,cgvarela/compose,glogiotatidis/compose,twitherspoon/compose,abesto/fig,noironetworks/compose,bcicen/fig,danix800/docker.github.io,lukemarsden/compose,talolard/compose,sanscontext/docker.github.io,DoubleMalt/compose,shin-/docker.github.io,ain/compose,jzwlqx/denverdino.github.io,londoncalling/docker.github.io,runcom/compose,ph-One/compose,amitsaha/compose,tiry/compose,rillig/docker.github.io,philwrenn/compose,TomasTomecek/compose,swoopla/compose,genki/compose,simonista/compose,mdaue/compose,hypriot/compose,docker/docker.github.io,thaJeztah/docker.github.io,heroku/fig,browning/compose,bbirand/compose,johnstep/docker.github.io,bdwill/docker.github.io,artemkaint/compose,shubheksha/docker.github.io,screwgoth/compose,jonaseck2/compose,docker/docker.github.io,TomasTomecek/compose,talolard/compose,bsmr-docker/compose,charleswhchan/compose,denverdino/docker.github.io,simonista/compose,shin-/compose,docker-zh/docker.github.io,bfirsh/fig,lukemarsden/compose,kikkomep/compose,goloveychuk/compose,pspierce/compose,amitsaha/compose,GM-Alex/compose,bobphill/compose,phiroict/docker,mnowster/compose,iamluc/compose,gdevillele/docker.github.io,rstacruz/compose,sebglazebrook/compose,TheDataShed/compose,aduermael/docker.github.io,mark-adams/compose,charleswhchan/compose,denverdino/docker.github.io,uvgroovy/compose,VinceBarresi/compose,kikkomep/compose,thieman/compose,mark-adams/compose,andrewgee/compose,prologic/compose,au-phiware/compose,gtrdotmcs/compose,menglingwei/denverdino.github.io,hoogenm/compose,denverdino/docker.github.io,jonaseck2/compose,rgbkrk/compose,alunduil/fig,tpounds/compose,shin-/docker.github.io,LuisBosquez/docker.github.io,danix800/docker.github.io,danix800/docker.github.io,anweiss/docker.github.io,mnowster/compose,vdemeester/compose,joaofnfernandes/docker.github.io,alexisbellido/docker.github.io,ouziel-slama/compose,Chouser/compose,phiroict/docker,tangkun75/compose,BSWANG/denverdino.github.io,zhangspook/compose,goloveychuk/compose,glogiotatidis/compose,docker-zh/docker.github.io,joaofnfernandes/docker.github.io,ggtools/compose,mohitsoni/compose,shubheksha/docker.github.io,xydinesh/compose,ggtools/compose,aduermael/docker.github.io,vdemeester/compose,mbailey/compose,ionrock/compose,abesto/fig,rstacruz/compose,johnstep/docker.github.io,gdevillele/docker.github.io,dbdd4us/compose,denverdino/denverdino.github.io,schmunk42/compose,joeuo/docker.github.io,aduermael/docker.github.io,marcusmartins/compose,sanscontext/docker.github.io,anweiss/docker.github.io,calou/compose,sdurrheimer/compose,michael-k/docker-compose,dopry/compose,bbirand/compose,DoubleMalt/compose,marcusmartins/compose,kojiromike/compose,dnephin/compose,tpounds/compose,denverdino/docker.github.io,jzwlqx/denverdino.github.io,bdwill/docker.github.io,dilgerma/compose,vlajos/compose,shakamunyi/fig,aanand/fig,bsmr-docker/compose,shubheksha/docker.github.io,thaJeztah/docker.github.io,KevinGreene/compose,shin-/compose,johnstep/docker.github.io,mrfuxi/compose,BSWANG/denverdino.github.io,Dakno/compose,ZJaffee/compose,heroku/fig,jeanpralo/compose,lmesz/compose,GM-Alex/compose,menglingwei/denverdino.github.io,feelobot/compose,alexisbellido/docker.github.io,denverdino/denverdino.github.io,docker/docker.github.io,jiekechoo/compose,jrabbit/compose,jiekechoo/compose,unodba/compose,dockerhn/compose,feelobot/compose,sdurrheimer/compose,heroku/fig,bdwill/docker.github.io,sebglazebrook/compose,docker-zh/docker.github.io,JimGalasyn/docker.github.io,d2bit/compose,BSWANG/denverdino.github.io,sanscontext/docker.github.io,aduermael/docker.github.io,qzio/compose,shakamunyi/fig,rillig/docker.github.io,mnuessler/compose,vlajos/compose,LuisBosquez/docker.github.io,bdwill/docker.github.io,troy0820/docker.github.io,benhamill/compose,jorgeLuizChaves/compose,nhumrich/compose,shin-/docker.github.io,alexisbellido/docker.github.io,alexandrev/compose,screwgoth/compose,troy0820/docker.github.io,shin-/docker.github.io,dilgerma/compose,thaJeztah/docker.github.io,andrewgee/compose,runcom/compose,docker/docker.github.io,tangkun75/compose,londoncalling/docker.github.io,ph-One/compose,ouziel-slama/compose,ain/compose,ralphtheninja/compose,jrabbit/compose,hypriot/compose,jgrowl/compose,j-fuentes/compose,dnephin/compose,ionrock/compose,anweiss/docker.github.io,au-phiware/compose,BSWANG/denverdino.github.io,sanscontext/docker.github.io,ralphtheninja/compose,phiroict/docker,moxiegirl/compose,hoogenm/compose,josephpage/compose,phiroict/docker,gtrdotmcs/compose,joeuo/docker.github.io,johnstep/docker.github.io,saada/compose,mbailey/compose,menglingwei/denverdino.github.io,swoopla/compose,schmunk42/compose,troy0820/docker.github.io,jzwlqx/denverdino.github.io,docker-zh/docker.github.io,calou/compose,shubheksha/docker.github.io,saada/compose,RobertNorthard/compose,MSakamaki/compose,cclauss/compose,rillig/docker.github.io,artemkaint/compose,benhamill/compose,thaJeztah/compose,nerro/compose,joaofnfernandes/docker.github.io,Chouser/compose,bfirsh/fig,pspierce/compose,alexisbellido/docker.github.io,ZJaffee/compose,josephpage/compose,browning/compose,rgbkrk/compose,viranch/compose,funkyfuture/docker-compose,joaofnfernandes/docker.github.io,joaofnfernandes/docker.github.io,anweiss/docker.github.io,genki/compose,menglingwei/denverdino.github.io,uvgroovy/compose,nhumrich/compose,gdevillele/docker.github.io,TheDataShed/compose,MSakamaki/compose,dockerhn/compose,denverdino/compose,jeanpralo/compose,denverdino/denverdino.github.io,thaJeztah/compose,bcicen/fig,KalleDK/compose,jessekl/compose,phiroict/docker,joeuo/docker.github.io,ekristen/compose,brunocascio/compose,Katlean/fig,VinceBarresi/compose,KevinGreene/compose,mdaue/compose,mosquito/docker-compose,shin-/docker.github.io,jzwlqx/denverdino.github.io,LuisBosquez/docker.github.io,mchasal/compose,iamluc/compose,bobphill/compose,docker/docker.github.io,mosquito/docker-compose