Update chain_app.py

chain_app.py

@@ -95,6 +95,11 @@ async def chat_profile():
 @cl.on_chat_start
 async def on_chat_start():
     chat_profile = cl.user_session.get("chat_profile")
+    if not chat_profile:
+        await cl.Message(
+            content='please choose a model to start'
+        ).send()
+    
     if chat_profile == 'neural-brain-AI':
         await cl.ChatSettings(
             [
@@ -103,9 +108,9 @@ async def on_chat_start():
                 label="NeuralBrain - Models",
                 values=["Neural Brain AI"],
                 initial_index=0,
-            )
+                )
             ]
-            ).send()
+        ).send()
         await cl.Message(
             content="Hello, I am the main model of neural brain team, i am an instance of ChatGPT-4, This team finetuned me and i am ready to help you"
         ).send()