Update app.py

app.py

@@ -503,9 +503,9 @@ def chat_app_logic(message, history):
             if isinstance(part, str):
                 response_parts.append(part)
             elif isinstance(part, dict) and 'content' in part:
-                response_parts.append(part['content'])
+                response_parts.append(part['content']),
         
-        response = ''.join(response_parts
+        response = ''.join(response_parts,
         # Run the model and get the response (convert generator to string)
             prompt=message,
             history=history,