fix(pulumi): no-op DestroyChildStack when child stack was never deployed#368

SAY-5 wants to merge 2 commits into

simple-container-com:mainsimple-container-com/api:mainfrom

SAY-5:fix-destroy-child-stack-nil-guardSAY-5/api:fix-destroy-child-stack-nil-guardCopy head branch name to clipboard