Merge pull request #26925 from ZTE-PaaS/249043822-patch-1

Automatic merge from submit-queue

optimize deleteFromIndices method of thread_safe_store

As all methods of thread_safe_store are threadsafe, so i think, in deleteFromIndices method, if the index is nil, need not run the for structure below

pkg/client/cache/thread_safe_store.go

@@ -261,15 +261,16 @@ func (c *threadSafeMap) deleteFromIndices(obj interface{}, key string) error {
 		}
 
 		index := c.indices[name]
+		if index == nil {
+			continue
+		}
 		for _, indexValue := range indexValues {
-			if index != nil {
 			set := index[indexValue]
 			if set != nil {
 				set.Delete(key)
 			}
 		}
 	}
-	}
 	return nil
 }