fix: enhance reasoning content handling in base_chat_open_ai.py

Author: wxg0103

apps/models_provider/impl/base_chat_open_ai.py

@@ -32,8 +32,8 @@ def _convert_delta_to_message_chunk(
     role = cast(str, _dict.get("role"))
     content = cast(str, _dict.get("content") or "")
     additional_kwargs: dict = {}
-    if 'reasoning_content' in _dict or 'reasoning' in _dict:
-        additional_kwargs['reasoning_content'] = _dict.get('reasoning_content') or _dict.get('reasoning')
+    if reasoning := _dict.get('reasoning_content') or _dict.get('reasoning'):
+        additional_kwargs['reasoning_content'] = reasoning
     if _dict.get("function_call"):
         function_call = dict(_dict["function_call"])
         if "name" in function_call and function_call["name"] is None: