If moodleauth fails, send request to admins, no personal data shared as \`Data\` has to be empty

fix

fix

l2pauth.py

 from server import *
 import requests
+from mail import notify_admins
 
 L2P_BASE = 'https://www3.elearning.rwth-aachen.de/_vti_bin/l2pservices/api.svc/v1/'
 OAUTH_BASE = 'https://oauth.campus.rwth-aachen.de/oauth2waitress/oauth2.svc/'
@@ -66,7 +67,12 @@ def finish_oauth():
 			session['l2p_courses'].append(course['uniqueid'])
 	elif session['oauthscope'] == 'moodle':
 		session['moodle_courses'] = []
-		for course in moodleget('getmyenrolledcourses', token['access_token'])['Data']:
+		data = moodleget('getmyenrolledcourses', token['access_token'])
+		if data and data.get('Data'):
+			for course in data['Data']:
 				session['moodle_courses'].append(str(course['id']))
+		else:
+			notify_admins('endpoint_exception', traceback=f"finish_oauth failed while getting moodle courses, data={str(data)}")
+			raise
 	del session['oauthscope']
 	oauthget('token', refresh_token=token['refresh_token'], grant_type='invalidate')