Fix panic on empty/sign-only --kubernetes-feature-gates - #18430

Fix panic on empty/sign-only --kubernetes-feature-gates#18430

vigneshakaviki wants to merge 2 commits into

kubernetes:masterkubernetes/kops:masterfrom

vigneshakaviki:fix/feature-gates-panicvigneshakaviki/kops:fix/feature-gates-panicCopy head branch name to clipboard