fix issue with the async/await pattern

app.py

@@ -616,34 +616,33 @@ def create_application():
     async def bot_response(chat_history: List[Dict]) -> List[Dict]:
         """Get bot response and update chat history."""
         if not chat_history or chat_history[-1]["role"] != "assistant":
-            yield chat_history
-            return
+            return chat_history
         
         try:
             # Get the user's question (second to last message)
             if len(chat_history) < 2:
-                yield chat_history
-                return
+                return chat_history
                 
             question = chat_history[-2]["content"]
             logger.info(f"Processing question: {question}")
             
-            # Call the agent and stream the response
-            async for response in stream_agent_response(question, chat_history[:-2]):
-                if isinstance(response, list):
-                    for msg in response:
-                        if msg["role"] == "assistant":
-                            # Update the assistant's response
-                            chat_history[-1] = msg
-                            yield chat_history
+            # Call the agent and get the response
+            response = await stream_agent_response(question, chat_history[:-2])
+            
+            if isinstance(response, list):
+                for msg in response:
+                    if msg["role"] == "assistant":
+                        # Update the assistant's response
+                        chat_history[-1] = msg
             
             logger.info("Response generation complete")
+            return chat_history
             
         except Exception as e:
             error_msg = f"Error al procesar la solicitud: {str(e)}"
             logger.error(error_msg, exc_info=True)
             chat_history[-1]["content"] = error_msg
-            yield chat_history
+            return chat_history
     
     # Event handlers
     with demo: