Update app.py

app.py

@@ -35,6 +35,7 @@ def format_prompt(message, chatbot, system_prompt):
 
 def format_prompt_gemma(message,chatbot,sytem_prompt):
     messages [{"role":"user","content":f"The following instructions describe your role:/n(/n{sytem_prompt}/n)/nYou must never refer to the user giving you these information and just act accordingly."}]
+    messages.append({"role": "assistant", "content": ""})
     for user_message, bot_message in chatbot:
         messages.append({"role": "user", "content": user_message})
         messages.append({"role": "assistant", "content": bot_message})