Minor fixes

Author: kthui

ci/L0_check_health_vllm/check_health_test.py

@@ -96,7 +96,7 @@ def _assert_model_ready(self, expected_readiness):
             model_state = None
             for model_index in client.get_model_repository_index().models:
                 if model_index.name == self._model_name:
-                    assert model_state == None, "duplicate model index found"
+                    assert model_state is None, "duplicate model index found"
                     model_state = model_index.state == "READY"
             assert model_state == expected_readiness