Update app.py

app.py

@@ -35,8 +35,7 @@ animation: pulse 1.5s infinite ease-in-out;
 """
 
 def respond(message, history, system_message, max_tokens, temperature, top_p):
-messages = [{"role": "system", "content": system_message}] 
-if system_message else []
+     messages = [{"role": "system", "content": system_message}] if system_message else []
 
 for user, assistant in history:  
     if user: