[Frontend] Use new Renderer for Completions and Tokenize API (#32863)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

tests/entrypoints/pooling/classify/test_online.py

@@ -128,12 +128,10 @@ def test_empty_input_error(server: RemoteOpenAIServer, model_name: str):
         server.url_for("classify"),
         json={"model": model_name, "input": []},
     )
-    classification_response.raise_for_status()
-    output = ClassificationResponse.model_validate(classification_response.json())
 
-    assert output.object == "list"
-    assert isinstance(output.data, list)
-    assert len(output.data) == 0
+    error = classification_response.json()
+    assert classification_response.status_code == 400
+    assert "error" in error
 
 
 @pytest.mark.parametrize("model_name", [MODEL_NAME])