smol fixes

app.py

@@ -72,10 +72,15 @@ def execute_jupyter_agent(
 
     # Initialize message_history if it doesn't exist
     if len(message_history) == 0:
+        if files is None:
+            system_message = sytem_prompt.format("None")
+        else:
+            sytem_prompt.format("- " + "\n- ".join(filenames))
+
         message_history.append(
             {
                 "role": "system",
-                "content": sytem_prompt.format("- " + "\n- ".join(filenames)) if files is not None else "None",
+                "content": system_message,
             }
         )
     message_history.append({"role": "user", "content": user_input})