Remove None to keep the code clean

Author: GaoLeiA

xinference/ui/gradio/chat_interface.py

@@ -503,11 +503,11 @@ def generate_html_audio(audio_path):
                 message = {"role": "user", "content": text}
             history = history + [message]
             bot = bot + [[display_content, None]]
-            return history, bot, "", None, None, None, None
+            return history, bot, "", None, None, None
 
         def clear_history():
             logger.debug("Clear history.")
-            return [], None, "", None, None, None, None
+            return [], None, "", None, None, None
 
         def update_button(text):
             return gr.update(interactive=bool(text))