Update app.py

app.py

@@ -70,7 +70,8 @@ async def on_chat_start():
     ).send()
 
     # Check if ticker_response is None or lacks 'content'
-    if ticker_response is None or 'content' not in ticker_response:
+    #if ticker_response is None or 'content' not in ticker_response:
+    if not ticker_response or 'content' not in ticker_response:
         await cl.Message(content="No ticker symbol provided. Please enter a valid ticker symbol to proceed.").send()
         return