Update app.py

app.py

@@ -78,7 +78,7 @@ def refresh_file_display(state_dict: Dict) -> List[str]:
 
 
 def restart_ui(history: List) -> Tuple[List, Dict, Dict, Dict, Dict]:
-    history.append(["Welcome to the chatbot!", ""])
+    history.clear()
     return (
         history,
         gr.Textbox.update(value="", interactive=False),
@@ -99,7 +99,7 @@ def bot(state_dict: Dict, history: List) -> List:
     while bot_backend.finish_reason in ('new_input', 'function_call'):
         if history[-1][0] is None:
             history.append(
-                ['welcome', ""]
+                [None, ""]
             )
         else:
             history[-1][1] = ""