test(llm_translation): expect an empty choices list to convert instead of raising

tests/llm_translation/test_llm_response_utils/test_convert_dict_to_chat_completion.py

@@ -1623,15 +1623,11 @@ class TestMissingChoicesGuard:
 
         assert "no 'choices'" in exc_info.value.message
 
-    def test_convert_to_model_response_object_empty_choices_raises_api_error(self):
-        """Empty choices list raises APIError, same as missing/null choices.
+    def test_convert_to_model_response_object_empty_choices_returns_empty_list(self):
+        """An empty choices list is a real provider answer, so it converts to choices=[] instead of raising.
 
-        Provider-specific repair (e.g. github_copilot synthesizing choices for
-        Anthropic-native responses) happens before this guard, in the provider
-        config; the core utility keeps treating empty choices as an error.
+        See: https://github.com/BerriAI/litellm/issues/40276
         """
-        from litellm.exceptions import APIError
-
         response_object = {
             "id": "msg_123",
             "model": "some-model",
@@ -1639,13 +1635,14 @@ class TestMissingChoicesGuard:
             "usage": {"prompt_tokens": 10, "completion_tokens": 1, "total_tokens": 11},
         }
 
-        with pytest.raises(APIError) as exc_info:
-            convert_to_model_response_object(
-                response_object=response_object,
-                model_response_object=ModelResponse(),
-            )
+        result = convert_to_model_response_object(
+            response_object=response_object,
+            model_response_object=ModelResponse(),
+        )
 
-        assert "no 'choices'" in exc_info.value.message
+        assert isinstance(result, ModelResponse)
+        assert result.choices == []
+        assert result.usage.prompt_tokens == 10
 
     def test_convert_to_model_response_object_null_choices_raises_api_error(self):
         """choices=None raises APIError."""