command/build: skip nil builds [GH-2163]
command/build: skip nil builds [GH-2163]

tas50/packer,atlassian/packer,pieter-lazzaro/packer,stagrlee/packer,grubernaut/packer,avldya/packer,pecigonzalo/packer,manicai/packer,leroux/packer,dave2/packer,jgkim/packer,taliesins/packer,markpeek/packer,sobrinho/packer,dantran/packer,tsmolka/packer,rodm/packer,rrva/packer,mitchellh/packer,samdunne/packer,tsmolka/packer,sneal/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,tb3088/packer,napramirez/packer,jarl-dk/packer,quantang/packer,Silver90/packer,sobrinho/packer,yonglehou/packer,jen20/packer,feateds/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,timsutton/packer,Silver90/packer,Akasurde/packer,mayflower/packer,dantran/packer,ldejager/packer,higebu/packer,AlphaStaxLLC/packer,beni55/packer,Akasurde/packer,timsutton/packer,legal90/packer,mansunkuo/packer,atlassian/packer,feateds/packer,ephemeralsnow/packer,oliviertremblay/packer,Sheile/packer,arizvisa/packer,sean-/packer,aneeshusa/packer,Xiol/packer,burnzy/packer,jae2/packer,stagrlee/packer,tsmolka/packer,sansb/packer,dayglojesus/packer,mafrosis/packer,aneeshusa/packer,LinusU/packer,mafrosis/packer,hashicorp/packer,tomwilkie/packer,mgk/packer,grange74/packer,bryson/packer,zakuro9715/packer,KohlsTechnology/packer,Xiol/packer,p1-nico/packer,pvandervelde/packer,rrva/packer,sgirones/packer,timsutton/packer,ricardclau/packer,rnaveiras/packer,zeliff/packer,jasonchaffee/packer,avldya/packer,bryson/packer,marc-ta/packer,hazelesque/packer,mkuzmin/packer,markpeek/packer,jae2/packer,pearkes/packer,leroux/packer,mansunkuo/packer,monsterzz/packer,arizvisa/packer,jarl-dk/packer,vtolstov/packer,dev-head/packer,mitchellh/packer,pearkes/packer,jamesleech/packer,danschaffer/packer,mkuzmin/packer,smaato/packer,jen20/packer,jamesbishopp/packer,zhuzhih2017/packer,leroux/packer,paulmey/packer,markpeek/packer,pieter-lazzaro/packer,orivej/packer,pieter-lazzaro/packer,routelastresort/packer,mkuzmin/packer,monsterzz/packer,c22/packer,icnocop/packer,evertrue/packer,legal90/packer,napramirez/packer,feateds/packer,dayglojesus/packer,sequenceiq/packer,ttaylor249/packer,jimmythedog/packer,trumant/packer,ephemeralsnow/packer,vtolstov/packer,icnocop/packer,dantran/packer,noplay/packer,mohae/packer,oliviertremblay/packer,timsutton/packer,samdunne/packer,sobrinho/packer,burnzy/packer,styro/packer,mkuzmin/packer,arizvisa/packer,youhong316/packer,zhuzhih2017/packer,mkuzmin/packer,mgk/packer,life360/packer,yonglehou/packer,ricardclau/packer,beni55/packer,bhcleek/packer,avldya/packer,c22/packer,paulmey/packer,hashicorp/packer,BayanGroup/packer,israelshirk/packer,hazelesque/packer,zeliff/packer,feateds/packer,jmptrader/packer,icnocop/packer,jmptrader/packer,mefellows/packer,dantran/packer,dantran/packer,fnoeding/packer,higebu/packer,fnoeding/packer,marc-ta/packer,pecigonzalo/packer,paulvollmer/packer,jonathankarsh/packer,rickard-von-essen/packer,gbarberi/packer,pieter-lazzaro/packer,mitchellh/packer,ChrisLundquist/packer,sequenceiq/packer,grubernaut/packer,justincampbell/packer,jen20/packer,sneal/packer,esemplare/packer,esemplare/packer,jamesbishopp/packer,mwhooker/packer,lantrix/packer,jarl-dk/packer,mefellows/packer,sansb/packer,hasJackb/packer,vtolstov/packer,burnzy/packer,jamesbishopp/packer,tomwilkie/packer,grubernaut/packer,KohlsTechnology/packer,pearkes/packer,Cbeck527/packer,paulvollmer/packer,jean/packer,rk295/packer,fnoeding/packer,pvanbuijtene/packer,p1-nico/packer,ldejager/packer,visioncritical/packer,visioncritical/packer,p1-nico/packer,quantang/packer,mkuzmin/packer,KFishner/packer,tsmolka/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,eranchetz/packer,tb3088/packer,mayflower/packer,samdunne/packer,pvandervelde/packer,ricardclau/packer,kpettijohn/packer,gbarberi/packer,sansb/packer,pvanbuijtene/packer,ricardclau/packer,KFishner/packer,aneeshusa/packer,timsutton/packer,blairham/packer,jamesbishopp/packer,ChrisLundquist/packer,routelastresort/packer,monsterzz/packer,marklap/packer,ttaylor249/packer,grange74/packer,visioncritical/packer,taliesins/packer,Sheile/packer,bryson/packer,jimmythedog/packer,blairham/packer,sgirones/packer,rk295/packer,jsternberg/packer,dieu/packer,dayglojesus/packer,tb3088/packer,danschaffer/packer,kgrvamsi/packer,grange74/packer,KohlsTechnology/packer,Silver90/packer,tas50/packer,mvanholsteijn/packer,noplay/packer,jgkim/packer,masbog/packer,arizvisa/packer,dieu/packer,styro/packer,hazelesque/packer,smaato/packer,yoctocloud/packer,jae2/packer,higebu/packer,mefellows/packer,jgkim/packer,mohae/packer,jasonchaffee/packer,markpeek/packer,youhong316/packer,lantrix/packer,life360/packer,markpeek/packer,styro/packer,smaato/packer,marc-ta/packer,tas50/packer,marklap/packer,beni55/packer,youhong316/packer,jasonchaffee/packer,visioncritical/packer,legal90/packer,sgirones/packer,KohlsTechnology/packer,yoctocloud/packer,ldejager/packer,rk295/packer,rodm/packer,hashicorp/packer,quantang/packer,aneeshusa/packer,BayanGroup/packer,taliesins/packer,Akasurde/packer,monkeylittleinc/packer,danschaffer/packer,ricardclau/packer,yonglehou/packer,ttaylor249/packer,jamesleech/packer,mafrosis/packer,ChrisLundquist/packer,manicai/packer,lantrix/packer,kpettijohn/packer,mvanholsteijn/packer,jen20/packer,threatstream/packer,tb3088/packer,btd/packer,pieter-lazzaro/packer,bryson/packer,rodm/packer,marklap/packer,routelastresort/packer,fnoeding/packer,LinusU/packer,israelshirk/packer,rnaveiras/packer,paulmey/packer,tb3088/packer,jimmythedog/packer,mohae/packer,mgk/packer,kgrvamsi/packer,paulmey/packer,mitchellh/packer,dev-head/packer,zeliff/packer,jsternberg/packer,yonglehou/packer,c22/packer,mvanholsteijn/packer,tas50/packer,gbarberi/packer,AlphaStaxLLC/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,gbarberi/packer,rrva/packer,Xiol/packer,dave2/packer,tb3088/packer,arizvisa/packer,rickard-von-essen/packer,noplay/packer,Cbeck527/packer,c22/packer,tomwilkie/packer,noplay/packer,legal90/packer,jsternberg/packer,jarl-dk/packer,Sheile/packer,sansb/packer,DualSpark/packer,bhcleek/packer,Cbeck527/packer,threatstream/packer,dieu/packer,marc-ta/packer,orivej/packer,bryson/packer,samdunne/packer,dave2/packer,israelshirk/packer,rk295/packer,mvanholsteijn/packer,mafrosis/packer,bensojona/packer,quantang/packer,rnaveiras/packer,DualSpark/packer,pvandervelde/packer,justincampbell/packer,threatstream/packer,trumant/packer,icnocop/packer,paulvollmer/packer,sgirones/packer,kpettijohn/packer,pvandervelde/packer,justincampbell/packer,rickard-von-essen/packer,zhuzhih2017/packer,threatstream/packer,rickard-von-essen/packer,pvanbuijtene/packer,rnaveiras/packer,mwhooker/packer,napramirez/packer,kpettijohn/packer,hasJackb/packer,yoctocloud/packer,taliesins/packer,monkeylittleinc/packer,icnocop/packer,ttaylor249/packer,mitchellh/packer,grubernaut/packer,tomwilkie/packer,youhong316/packer,sequenceiq/packer,Cbeck527/packer,zhuzhih2017/packer,smaato/packer,esemplare/packer,KohlsTechnology/packer,mwhooker/packer,sneal/packer,hashicorp/packer,zeliff/packer,life360/packer,mgk/packer,orivej/packer,monkeylittleinc/packer,sean-/packer,tas50/packer,bensojona/packer,jen20/packer,Sheile/packer,sneal/packer,pvandervelde/packer,hazelesque/packer,styro/packer,danschaffer/packer,napramirez/packer,bhcleek/packer,LinusU/packer,jen20/packer,gildas/packer-hyperv,monkeylittleinc/packer,Xiol/packer,jasonchaffee/packer,threatstream/packer,legal90/packer,dave2/packer,justincampbell/packer,esemplare/packer,gildas/packer-hyperv,esemplare/packer,leroux/packer,eranchetz/packer,youhong316/packer,orivej/packer,boumenot/packer,israelshirk/packer,rnaveiras/packer,mafrosis/packer,jgkim/packer,bryson/packer,atlassian/packer,jimmythedog/packer,ldejager/packer,pearkes/packer,sean-/packer,Silver90/packer,monsterzz/packer,BayanGroup/packer,KFishner/packer,jean/packer,AlphaStaxLLC/packer,eranchetz/packer,trumant/packer,ChrisLundquist/packer,jsternberg/packer,sean-/packer,lantrix/packer,boumenot/packer,DualSpark/packer,masbog/packer,mansunkuo/packer,masbog/packer,evertrue/packer,pvandervelde/packer,ephemeralsnow/packer,masbog/packer,pieter-lazzaro/packer,hasJackb/packer,sean-/packer,jonathankarsh/packer,burnzy/packer,quantang/packer,yoctocloud/packer,manicai/packer,jimmythedog/packer,routelastresort/packer,jmptrader/packer,dave2/packer,boumenot/packer,oliviertremblay/packer,p1-nico/packer,hasJackb/packer,dayglojesus/packer,mefellows/packer,paulvollmer/packer,atlassian/packer,c22/packer,Akasurde/packer,zhuzhih2017/packer,evertrue/packer,DualSpark/packer,jasonchaffee/packer,sobrinho/packer,danschaffer/packer,paulmey/packer,jonathankarsh/packer,pvanbuijtene/packer,blairham/packer,smaato/packer,higebu/packer,jamesleech/packer,jonathankarsh/packer,mohae/packer,mansunkuo/packer,Cbeck527/packer,sean-/packer,ChrisLundquist/packer,zhuzhih2017/packer,life360/packer,tas50/packer,trumant/packer,timsutton/packer,samdunne/packer,bensojona/packer,taliesins/packer,zakuro9715/packer,KohlsTechnology/packer,atlassian/packer,mansunkuo/packer,taliesins/packer,Akasurde/packer,mwhooker/packer,bensojona/packer,manicai/packer,rickard-von-essen/packer,ChrisLundquist/packer,jae2/packer,marklap/packer,AlphaStaxLLC/packer,markpeek/packer,tsmolka/packer,grange74/packer,mohae/packer,monkeylittleinc/packer,rrva/packer,eranchetz/packer,bhcleek/packer,atlassian/packer,pecigonzalo/packer,mayflower/packer,dayglojesus/packer,jean/packer,p1-nico/packer,zakuro9715/packer,blairham/packer,LinusU/packer,grubernaut/packer,gildas/packer-hyperv,gildas/packer-hyperv,jmptrader/packer,stagrlee/packer,sequenceiq/packer,BayanGroup/packer,arizvisa/packer,dev-head/packer,grange74/packer,dave2/packer,evertrue/packer,grubernaut/packer,dev-head/packer,life360/packer,tsmolka/packer,stagrlee/packer,mayflower/packer,vtolstov/packer,boumenot/packer,ricardclau/packer,rnaveiras/packer,btd/packer,pecigonzalo/packer,paulmey/packer,kgrvamsi/packer,boumenot/packer,kgrvamsi/packer,zakuro9715/packer,mayflower/packer,mwhooker/packer,p1-nico/packer,vtolstov/packer,beni55/packer,rodm/packer,routelastresort/packer,btd/packer,ephemeralsnow/packer,avldya/packer,dieu/packer,ephemeralsnow/packer,oliviertremblay/packer,c22/packer,jean/packer,KFishner/packer,bhcleek/packer,ttaylor249/packer,sneal/packer,youhong316/packer,yoctocloud/packer,pvanbuijtene/packer,btd/packer,smaato/packer,higebu/packer,jamesleech/packer