Update app.py

app.py

@@ -456,9 +456,9 @@ def handsome_chat_completions():
                                     ):
                                         delta = response_json["choices"][0].get("delta", {})
                                         new_content = ""
-                                        if "reasoning_content" in delta:
+                                        if "reasoning_content" in delta and delta["reasoning_content"] is not None:
                                             new_content += "> " + delta["reasoning_content"]
-                                        if "content" in delta:
+                                        if "content" in delta and delta["content"] is not None:
                                             new_content += delta["content"]
 
                                         if new_content: