Automatic merge from submit-queue
Fix possible panic in PodAffinityChecker
In `PodAffinityChecker.getMatchingAntiAffinityTerms()` `affinity.PodAntiAffinity` can be `nil` in this place. This problem occurs e.g. when `nil` is passed as `meta` to `PodAffinityChecker.InterPodAffinityMatches()`.
Stumbled upon it while working on #31136 (someone PTAL at that PR too, I've submitted it a month ago and seemingly no one noticed it), kube-controller-manager was crashing there.
d17c6b903a