Extend tests for empty buildah run command
Extend tests for empty buildah run command

Signed-off-by: pixdrift <support@pixeldrift.net>

Closes: #656
Approved by: rhatdan

nalind/buildah,nalind/buildah-1,projectatomic/buildah,nalind/buildah-1,rhatdan/buildah,projectatomic/buildah,ipbabble/buildah,ipbabble/buildah,TomSweeneyRedHat/buildah,TomSweeneyRedHat/buildah,TomSweeneyRedHat/buildah,projectatomic/buildah,nalind/buildah-1,rhatdan/buildah,rhatdan/buildah,nalind/buildah