Merge branch 'patch-1' into 'master'

Fix Issue #382

See merge request !32

importer.py

@@ -139,10 +139,11 @@ def fetch_ro_course_events(item):
 	args = urllib.parse.parse_qs(url.query)
 	if 'pStpSpNr' in args: # Legacy URLs
 		id = args['pStpSpNr'][0]
-	elif url.path.split('/')[-2] == 'courses': # New URLs
+	elif len(url.path.split('/')) > 1 and url.path.split('/')[-2] == 'courses': # New URLs
 		id = url.path.split('/')[-1]
 	else:
-		flash("Ungültige URL: '"+i['url']+"'")
+		flash("Ungültige URL: '"+url.geturl()+"'")
+		return [] #cant get events from wrong URL so just return empty list
 	cal = icalendar.Calendar().from_ical(fetch_ro_course_ical(id))
 	events = []
 	for comp in cal.subcomponents: