ContainerCreate shouldn't return warnings=nil
ContainerCreate shouldn't return warnings=nil

Fixes #38222
Closes #38614 (carried)

Signed-off-by: Tibor Vass <3f1326dff4d85ad4ec938fb33f64575ace96db26@docker.com>

paralin/docker,nawawi/docker,jlhawn/docker,konstruktoid/docker-1,moul/docker,rremer/moby,jlhawn/docker,nalind/docker,justincormack/docker,dims/docker,trebonian/docker,konstruktoid/docker-1,Mokolea/docker,gnailuy/docker,mahak/docker,rremer/moby,jameszhan/docker,jameszhan/docker,konstruktoid/docker-upstream,mikebrow/docker,konstruktoid/docker-upstream,jthelin/docker,AkihiroSuda/docker,paralin/docker,vdemeester/docker,nawawi/docker,jameszhan/docker,flavio/docker,docker/docker,Mokolea/docker,cpuguy83/docker,pradipd/moby,yosifkit/docker,cpuguy83/docker,estesp/docker,trebonian/docker,kolyshkin/moby,kolyshkin/moby,konstruktoid/docker-1,docker/docker,bearstech/moby,crosbymichael/docker,SvenDowideit/docker,jvanz/docker,moby/moby,paralin/docker,Ramzec/docker,yongtang/docker,unclejack/docker,cpuguy83/docker,tmp6154/docker,thaJeztah/docker,nalind/docker,crosbymichael/docker,mahak/docker,moul/docker,jlhawn/docker,djs55/docker,moul/docker,gnailuy/docker,thaJeztah/docker,ibuildthecloud/docker,moby/moby,ibuildthecloud/docker,paralin/docker,nalind/docker,tmp6154/docker,nawawi/docker,vdemeester/docker,kolyshkin/moby,Ramzec/docker,justincormack/docker,jwhonce/docker,yongtang/docker,mahak/docker,nawawi/docker,jvanz/docker,bearstech/moby,SvenDowideit/docker,estesp/docker,moby/moby,pradipd/moby,ibuildthecloud/docker,bearstech/moby,rremer/moby,AkihiroSuda/docker,cpuguy83/docker,flavio/docker,pradipd/moby,Mokolea/docker,unclejack/docker,Ramzec/docker,konstruktoid/docker-upstream,docker/docker,thaJeztah/docker,trebonian/docker,moul/docker,thaJeztah/docker,ibuildthecloud/docker,jwhonce/docker,flavio/docker,yosifkit/docker,vdemeester/docker,SvenDowideit/docker,dims/docker,yosifkit/docker,jimjag/docker,unclejack/docker,crosbymichael/docker,ibuildthecloud/docker,moby/moby,flavio/docker,dims/docker,justincormack/docker,gnailuy/docker,kojiromike/docker,Ramzec/docker,jvanz/docker,AkihiroSuda/docker,nalind/docker,tmp6154/docker,jimjag/docker,jwhonce/docker,djs55/docker,AkihiroSuda/docker,estesp/docker,kojiromike/docker,mahak/docker,yongtang/docker,mikebrow/docker,gnailuy/docker,trebonian/docker,djs55/docker,konstruktoid/docker-upstream,mikebrow/docker,jimjag/docker,kojiromike/docker,bearstech/moby,jimjag/docker,jthelin/docker,Mokolea/docker,yosifkit/docker