Fix exception when creating application
Fix exception when creating application

If container assigned to the application being created does not have the
port exposed at all, `AttributeError` will be raised, since we try to do
`None.get`.

wujingke/shipyard,OnePaaS/shipyard,swege/shipyard,bkcsoft/shipyard,swege/shipyard,chenrui2014/shipyard,eedevops/shipyard,zhoffice/shipyard,rbramwell/shipyard,daququ/shipyard,vanloswang/shipyard,ehazlett/shipyard,daququ/shipyard,RustJason/shipyard,LongTaiJun/DockerUI,Lev09/shipyard,dockerclubgroup/shipyard,eedevops/shipyard,scapewang/shipyard,chenrui2014/shipyard,zhiwei55/shipyard,jsyinwenjun/shipyard,pugna0/shipyard,eedevops/shipyard,ehazlett/shipyard,iamjakob/shipyard,John-Lin/shipyard,svdata/shipyard,dockerclubgroup/shipyard,bkcsoft/shipyard,rbramwell/shipyard,golang-lib/shipyard,pugna0/shipyard,leominov/shipyard,beyondblog/shipyard,daququ/shipyard,zhiwei55/shipyard,tombee/shipyard,LongTaiJun/DockerUI,rbramwell/shipyard,svdata/shipyard,svdata/shipyard,rchicoli/shipyard,pugna0/shipyard,leominov/shipyard,leroy-chen/shipyard,LongTaiJun/DockerUI,zhiwei55/shipyard,rchicoli/shipyard,jsyinwenjun/shipyard,OnePaaS/shipyard,linecheng/shipyard,Dumbear/shipyard,vanloswang/shipyard,wujingke/shipyard,zhoffice/shipyard,zhoffice/shipyard,rchicoli/shipyard,Dumbear/shipyard,ehazlett/shipyard,RustJason/shipyard,leroy-chen/shipyard,rockzeng/shipyard,Lev09/shipyard,golang-lib/shipyard,pugna0/shipyard,tombee/shipyard,scapewang/shipyard,linecheng/shipyard,daququ/shipyard,scapewang/shipyard,rchicoli/shipyard,rockzeng/shipyard,svdata/shipyard,RustJason/shipyard,OnePaaS/shipyard,swege/shipyard,zhoffice/shipyard,chenrui2014/shipyard,linecheng/shipyard,iamjakob/shipyard,leominov/shipyard,beyondblog/shipyard,Dumbear/shipyard,OnePaaS/shipyard,linecheng/shipyard,John-Lin/shipyard,bkcsoft/shipyard,golang-lib/shipyard,rbramwell/shipyard,dockerclubgroup/shipyard,beyondblog/shipyard,wujingke/shipyard,zhiwei55/shipyard,Dumbear/shipyard,vanloswang/shipyard,rockzeng/shipyard,tombee/shipyard,leroy-chen/shipyard,Lev09/shipyard,golang-lib/shipyard,leroy-chen/shipyard,Lev09/shipyard,bkcsoft/shipyard,chenrui2014/shipyard,jsyinwenjun/shipyard,beyondblog/shipyard,scapewang/shipyard,iamjakob/shipyard,tombee/shipyard,RustJason/shipyard,rockzeng/shipyard,swege/shipyard,dockerclubgroup/shipyard,John-Lin/shipyard,jsyinwenjun/shipyard,eedevops/shipyard,LongTaiJun/DockerUI,wujingke/shipyard,iamjakob/shipyard,leominov/shipyard,vanloswang/shipyard,John-Lin/shipyard,ehazlett/shipyard