Update app.py

app.py

@@ -5,6 +5,7 @@ import requests
 import pandas as pd
 from dotenv import load_dotenv # Keep for consistency if final_agent uses it
 import traceback # For better error logging
+from typing import Optional
 
 # --- Constants ---
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"