Automatic merge from submit-queue

Check endpoint subsets length before asserting addresses.

Fix #45824.

Panics were caused by [WaitForEndpointOnNode()](https://github.com/kubernetes/kubernetes/blob/3227f441577ff18e3dbb75db36bfd61a6aa69876/test/e2e/framework/service_util.go#L329). Check subsets length ahead to prevent panicing.

/assign @freehan

cc @wojtek-t 

**Release note**:

```release-note
NONE
```