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Automatic merge from submit-queue Add handling empty index key that may cause panic issue if len(indexKeys) == 0, "return indexKeys[0]" will cause unexpected result. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.kubernetes.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.kubernetes.io/reviews/kubernetes/kubernetes/29672) <!-- Reviewable:end -->