Kill script early if show is not in lists

The script will stop if the show is not found in lists. Before, non listed shows were trying to be sent without emails addresses, causing errors.

notify_on_added.py

@@ -42,6 +42,12 @@ users = [{'email': 'user1@gmail.com',
           'shows': ('show1', 'show2', 'show3', 'show4')
           }]
           
+# Kill script now if show_name is not in lists
+to = list('Match' for u in users if p.show_name in u['shows'])
+if not to:
+	exit
+
+# Join email addresses
 to = ','.join([u['email'] for u in users if p.show_name in u['shows']])
 
 # Email settings