Update app.py

app.py

@@ -444,16 +444,18 @@ def handsome_chat_completions():
                             chunk_json = json.loads(chunk.decode("utf-8").lstrip("data: ").strip())
                             if "choices" in chunk_json and len(chunk_json["choices"]) > 0:
                                 delta = chunk_json["choices"][0].get("delta", {})
-                                if "reasoning_content" in delta:
-                                    reasoning_content_accumulated += delta["reasoning_content"]
+                                
+                                if delta.get("reasoning_content") is not None:
+                                    reasoning_content_accumulated += delta.get("reasoning_content", "")
                                     formatted_reasoning = f"```Thinking\n{reasoning_content_accumulated}\n```"
                                     yield f"data: {json.dumps({'choices': [{'delta': {'content': formatted_reasoning}, 'index': 0, 'finish_reason': None}]})}\n\n"
                                     reasoning_content_accumulated = ""
-                                if "content" in delta:
-                                    content_accumulated += delta["content"]
+
+                                if delta.get("content") is not None:
+                                    content_accumulated += delta.get("content", "")
                                     yield f"data: {json.dumps({'choices': [{'delta': {'content': content_accumulated}, 'index': 0, 'finish_reason': None}]})}\n\n"
                                     content_accumulated = ""
-                                    
+
                         except (KeyError, ValueError, json.JSONDecodeError) as e:
                             logging.error(f"解析流式响应单行 JSON 失败: {e}, 行内容: {chunk.decode('utf-8')}")
                             continue