Update app.py

app.py

@@ -9,8 +9,14 @@ from tempfile import NamedTemporaryFile
 from openpyxl import Workbook
 
 # Spotify API credentials from environment variables
-client_ids = os.getenv("SPOTIFY_CLIENT_IDS").split(',')
-client_secrets = os.getenv("SPOTIFY_CLIENT_SECRETS").split(',')
+client_ids = os.getenv("SPOTIFY_CLIENT_IDS")
+client_secrets = os.getenv("SPOTIFY_CLIENT_SECRETS")
+
+if not client_ids or not client_secrets:
+    raise ValueError("SPOTIFY_CLIENT_IDS or SPOTIFY_CLIENT_SECRETS environment variables not set.")
+
+client_ids = client_ids.split(',')
+client_secrets = client_secrets.split(',')
 current_api_index = 0
 
 # Request counters