fix panic when vagrant cloud response fails
fix panic when vagrant cloud response fails

rrva/packer,hashicorp/packer,sneal/packer,life360/packer,smaato/packer,pieter-lazzaro/packer,smaato/packer,rk295/packer,zhuzhih2017/packer,burnzy/packer,jen20/packer,LinusU/packer,AlphaStaxLLC/packer,sansb/packer,hazelesque/packer,monsterzz/packer,jonathankarsh/packer,quantang/packer,rnaveiras/packer,henrysher/packer,noplay/packer,quantang/packer,zakuro9715/packer,p1-nico/packer,KohlsTechnology/packer,arizvisa/packer,higebu/packer,shaunduncan/packer,pieter-lazzaro/packer,visioncritical/packer,feateds/packer,rickard-von-essen/packer,beni55/packer,mwhooker/packer,threatstream/packer,feateds/packer,mkuzmin/packer,rnaveiras/packer,pecigonzalo/packer,paulvollmer/packer,visioncritical/packer,noplay/packer,arizvisa/packer,pvanbuijtene/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,dayglojesus/packer,jen20/packer,threatstream/packer,leroux/packer,styro/packer,kpettijohn/packer,burnzy/packer,ephemeralsnow/packer,jamesleech/packer,dragon788/packer,cyberhouse/packer,Cbeck527/packer,manicai/packer,jae2/packer,marklap/packer,eranchetz/packer,mohae/packer,mwhooker/packer,gildas/packer-hyperv,pieter-lazzaro/packer,grubernaut/packer,dayglojesus/packer,arizvisa/packer,jmptrader/packer,mitchellh/packer,zhuzhih2017/packer,styro/packer,jsternberg/packer,ldejager/packer,zhuzhih2017/packer,dantran/packer,Xiol/packer,dantran/packer,stagrlee/packer,stagrlee/packer,mindjiver/packer,bryson/packer,sobrinho/packer,mayflower/packer,pieter-lazzaro/packer,mansunkuo/packer,pvanbuijtene/packer,jamesbishopp/packer,visioncritical/packer,timsutton/packer,jonathankarsh/packer,pieter-lazzaro/packer,israelshirk/packer,beni55/packer,tb3088/packer,grange74/packer,hasJackb/packer,Cbeck527/packer,avldya/packer,blairham/packer,bensojona/packer,cyberhouse/packer,timsutton/packer,pvandervelde/packer,evertrue/packer,dev-head/packer,lantrix/packer,cyberhouse/packer,yoctocloud/packer,jmptrader/packer,Sheile/packer,sneal/packer,dantran/packer,jen20/packer,zeliff/packer,dave2/packer,hashicorp/packer,c22/packer,LinusU/packer,sean-/packer,icnocop/packer,paulvollmer/packer,paulmey/packer,dave2/packer,avldya/packer,zeliff/packer,jimmythedog/packer,pvanbuijtene/packer,smaato/packer,jarl-dk/packer,p1-nico/packer,monsterzz/packer,life360/packer,mgk/packer,eranchetz/packer,trumant/packer,jsternberg/packer,atlassian/packer,ricardclau/packer,burnzy/packer,atlassian/packer,timsutton/packer,KohlsTechnology/packer,legal90/packer,uber/packer,paulvollmer/packer,gbarberi/packer,masbog/packer,ephemeralsnow/packer,uber/packer,rrva/packer,bensojona/packer,fnoeding/packer,dieu/packer,blairham/packer,gildas/packer-hyperv,kpettijohn/packer,KFishner/packer,sobrinho/packer,stagrlee/packer,icnocop/packer,marc-ta/packer,sean-/packer,bryson/packer,btd/packer,pvandervelde/packer,bhcleek/packer,napramirez/packer,mindjiver/packer,grubernaut/packer,beni55/packer,KohlsTechnology/packer,jasonchaffee/packer,kgrvamsi/packer,icnocop/packer,ephemeralsnow/packer,Banno/packer,zhuzhih2017/packer,taliesins/packer,Cbeck527/packer,kpettijohn/packer,ttaylor249/packer,stagrlee/packer,bensojona/packer,styro/packer,jimmythedog/packer,yonglehou/packer,Akasurde/packer,mitchellh/packer,danschaffer/packer,beni55/packer,masbog/packer,jsternberg/packer,hasJackb/packer,arizvisa/packer,ChrisLundquist/packer,Silver90/packer,hazelesque/packer,mkuzmin/packer,atlassian/packer,umang1912/packer,tas50/packer,legal90/packer,timsutton/packer,jszwedko/packer,sgirones/packer,shaunduncan/packer,grange74/packer,kgrvamsi/packer,ChrisLundquist/packer,higebu/packer,tracyde/packer,routelastresort/packer,tomwilkie/packer,sequenceiq/packer,mkuzmin/packer,bhcleek/packer,monkeylittleinc/packer,sobrinho/packer,jen20/packer,pieter-lazzaro/packer,ttaylor249/packer,life360/packer,rickard-von-essen/packer,mohae/packer,sansb/packer,leroux/packer,sean-/packer,jimmythedog/packer,c22/packer,ChrisLundquist/packer,yonglehou/packer,KFishner/packer,dayglojesus/packer,KohlsTechnology/packer,jen20/packer,rickard-von-essen/packer,jsternberg/packer,tomwilkie/packer,dragon788/packer,umang1912/packer,Akasurde/packer,c22/packer,boumenot/packer,burnzy/packer,mwhooker/packer,grubernaut/packer,mvanholsteijn/packer,eranchetz/packer,jonathankarsh/packer,shaunduncan/packer,tas50/packer,sequenceiq/packer,mvanholsteijn/packer,monsterzz/packer,higebu/packer,jae2/packer,sgirones/packer,dieu/packer,arizvisa/packer,shaunduncan/packer,paulmey/packer,arizvisa/packer,taliesins/packer,orivej/packer,yoctocloud/packer,samdunne/packer,pearkes/packer,lantrix/packer,vtolstov/packer,mansunkuo/packer,samdunne/packer,jean/packer,ttaylor249/packer,youhong316/packer,tsmolka/packer,vtolstov/packer,rrva/packer,tomwilkie/packer,rnaveiras/packer,zakuro9715/packer,jamesbishopp/packer,pecigonzalo/packer,jasonchaffee/packer,paulmey/packer,dev-head/packer,sean-/packer,mitchellh/packer,Cbeck527/packer,Banno/packer,KohlsTechnology/packer,pvandervelde/packer,grubernaut/packer,hasJackb/packer,btd/packer,sneal/packer,pvandervelde/packer,grubernaut/packer,markpeek/packer,rnaveiras/packer,mayflower/packer,legal90/packer,mansunkuo/packer,mefellows/packer,ricardclau/packer,bryson/packer,bryson/packer,rodm/packer,ttaylor249/packer,trumant/packer,henrysher/packer,aneeshusa/packer,grange74/packer,Cbeck527/packer,umang1912/packer,routelastresort/packer,umang1912/packer,Silver90/packer,life360/packer,orivej/packer,tsmolka/packer,kgrvamsi/packer,DualSpark/packer,rickard-von-essen/packer,pvandervelde/packer,yonglehou/packer,mansunkuo/packer,youhong316/packer,dev-head/packer,paulmey/packer,mafrosis/packer,tracyde/packer,marc-ta/packer,Sheile/packer,aneeshusa/packer,ricardclau/packer,AlphaStaxLLC/packer,avldya/packer,mgk/packer,esemplare/packer,smaato/packer,marklap/packer,mansunkuo/packer,c22/packer,sobrinho/packer,tomwilkie/packer,mitchellh/packer,oliviertremblay/packer,leroux/packer,paulmey/packer,jmptrader/packer,BayanGroup/packer,tb3088/packer,markpeek/packer,blairham/packer,quantang/packer,visioncritical/packer,dave2/packer,jasonchaffee/packer,hazelesque/packer,hashicorp/packer,BayanGroup/packer,sansb/packer,rickard-von-essen/packer,atlassian/packer,routelastresort/packer,Banno/packer,ChrisLundquist/packer,atlassian/packer,zhuzhih2017/packer,atlassian/packer,rnaveiras/packer,yoctocloud/packer,taliesins/packer,tas50/packer,marklap/packer,jen20/packer,monkeylittleinc/packer,jarl-dk/packer,jean/packer,monkeylittleinc/packer,jszwedko/packer,Akasurde/packer,tas50/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,KFishner/packer,mefellows/packer,higebu/packer,vtolstov/packer,legal90/packer,manicai/packer,Silver90/packer,justincampbell/packer,ricardclau/packer,tracyde/packer,kgrvamsi/packer,uber/packer,trumant/packer,jszwedko/packer,Akasurde/packer,marklap/packer,rodm/packer,rk295/packer,fnoeding/packer,jamesbishopp/packer,Sheile/packer,DualSpark/packer,israelshirk/packer,feateds/packer,yoctocloud/packer,ChrisLundquist/packer,youhong316/packer,dave2/packer,icnocop/packer,danschaffer/packer,AlphaStaxLLC/packer,napramirez/packer,bryson/packer,dragon788/packer,jgkim/packer,sequenceiq/packer,youhong316/packer,taliesins/packer,smaato/packer,KohlsTechnology/packer,hasJackb/packer,markpeek/packer,jasonchaffee/packer,Akasurde/packer,lantrix/packer,jimmythedog/packer,dantran/packer,boumenot/packer,avldya/packer,sneal/packer,markpeek/packer,jean/packer,danschaffer/packer,zakuro9715/packer,eranchetz/packer,mayflower/packer,trumant/packer,threatstream/packer,LinusU/packer,dayglojesus/packer,rrva/packer,grubernaut/packer,dieu/packer,jarl-dk/packer,tb3088/packer,evertrue/packer,bensojona/packer,evertrue/packer,legal90/packer,jgkim/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,ldejager/packer,paulmey/packer,pecigonzalo/packer,noplay/packer,dieu/packer,mwhooker/packer,justincampbell/packer,yonglehou/packer,henrysher/packer,youhong316/packer,fnoeding/packer,jonathankarsh/packer,vtolstov/packer,esemplare/packer,marc-ta/packer,ldejager/packer,mafrosis/packer,jgkim/packer,uber/packer,tb3088/packer,mayflower/packer,dayglojesus/packer,markpeek/packer,jamesleech/packer,btd/packer,jmptrader/packer,pecigonzalo/packer,ober/packer,p1-nico/packer,orivej/packer,mindjiver/packer,orivej/packer,israelshirk/packer,ephemeralsnow/packer,tb3088/packer,blairham/packer,mkuzmin/packer,rodm/packer,lantrix/packer,jae2/packer,ober/packer,pvanbuijtene/packer,DualSpark/packer,pearkes/packer,rodm/packer,mayflower/packer,boumenot/packer,jgkim/packer,sean-/packer,hazelesque/packer,quantang/packer,masbog/packer,Sheile/packer,sean-/packer,LinusU/packer,fnoeding/packer,sgirones/packer,monkeylittleinc/packer,samdunne/packer,c22/packer,feateds/packer,gbarberi/packer,leroux/packer,vtolstov/packer,jamesleech/packer,samdunne/packer,Xiol/packer,AlphaStaxLLC/packer,c22/packer,dragon788/packer,zeliff/packer,jimmythedog/packer,BayanGroup/packer,cyberhouse/packer,danschaffer/packer,dantran/packer,p1-nico/packer,p1-nico/packer,boumenot/packer,monsterzz/packer,jae2/packer,evertrue/packer,kpettijohn/packer,smaato/packer,israelshirk/packer,paulvollmer/packer,justincampbell/packer,youhong316/packer,pearkes/packer,Xiol/packer,esemplare/packer,tracyde/packer,threatstream/packer,BayanGroup/packer,dave2/packer,p1-nico/packer,mefellows/packer,zeliff/packer,zakuro9715/packer,justincampbell/packer,tsmolka/packer,tsmolka/packer,ttaylor249/packer,pearkes/packer,jean/packer,zhuzhih2017/packer,grange74/packer,esemplare/packer,timsutton/packer,mindjiver/packer,bryson/packer,mkuzmin/packer,ober/packer,mafrosis/packer,henrysher/packer,life360/packer,rk295/packer,marc-ta/packer,ricardclau/packer,mvanholsteijn/packer,icnocop/packer,mitchellh/packer,ricardclau/packer,mwhooker/packer,napramirez/packer,ChrisLundquist/packer,rk295/packer,markpeek/packer,dev-head/packer,manicai/packer,pvanbuijtene/packer,ober/packer,sansb/packer,jamesbishopp/packer,aneeshusa/packer,gbarberi/packer,mohae/packer,bhcleek/packer,KFishner/packer,tsmolka/packer,mgk/packer,ephemeralsnow/packer,gildas/packer-hyperv,quantang/packer,jszwedko/packer,ober/packer,styro/packer,noplay/packer,manicai/packer,pvandervelde/packer,mafrosis/packer,tsmolka/packer,danschaffer/packer,Silver90/packer,dave2/packer,timsutton/packer,jasonchaffee/packer,mkuzmin/packer,samdunne/packer,napramirez/packer,bhcleek/packer,ldejager/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,mafrosis/packer,jarl-dk/packer,taliesins/packer,hashicorp/packer,oliviertremblay/packer,threatstream/packer,mohae/packer,routelastresort/packer,gbarberi/packer,esemplare/packer,grange74/packer,sneal/packer,Xiol/packer,bhcleek/packer,higebu/packer,btd/packer,oliviertremblay/packer,routelastresort/packer,sgirones/packer,tb3088/packer,mgk/packer,sequenceiq/packer,jamesleech/packer,taliesins/packer,DualSpark/packer,mvanholsteijn/packer,tas50/packer,mohae/packer,aneeshusa/packer,boumenot/packer,masbog/packer,monkeylittleinc/packer,tas50/packer,rnaveiras/packer,mefellows/packer,oliviertremblay/packer,yoctocloud/packer,gildas/packer-hyperv