Fixed RSS feed handling of empty courses

feeds.py

@@ -10,7 +10,7 @@ def fixdate(d):
 
 @app.route('/feed')
 @app.route('/<handle>/feed')
-@handle_errors(None, 'Diese Veranstaltung existiert nicht!', 400, IndexError)
+@handle_errors(None, 'Diese Veranstaltung existiert nicht!', 404, IndexError)
 def feed(handle=None):
 	id = None
 	course = {'id': None, 'title': 'Neueste Videos', 'time_created': None, 'time_updated': None}
@@ -41,6 +41,7 @@ def feed(handle=None):
 	return Response(render_template('feed.atom', course=course, entries=entries), 200, {'Content-Type': 'application/atom+xml'})
 
 @app.route('/<handle>/rss')
+@handle_errors(None, 'Die Veranstaltung oder das Format existiert nicht!', 404, IndexError)
 def rss_feed(handle):
 	course = query('SELECT * FROM courses WHERE handle = ? AND visible', handle)[0]
 	formats = query('''SELECT formats.* FROM formats
@@ -49,13 +50,17 @@ def rss_feed(handle):
 			WHERE lectures.course_id = ?
 			GROUP BY formats.id
 			ORDER BY formats.player_prio DESC''', course['id'])
-	fmt = query('SELECT * FROM formats WHERE id = ?', request.values.get('format_id', formats[0]['id']))[0]
+	if not formats:
+		formats = query('SELECT * FROM formats WHERE id = 4 OR id = 5 OR id = 10') # 360p, 720p, 1080p
+	if 'format_id' not in request.values:
+		return redirect(url_for('rss_feed', handle=handle, format_id=formats[0]['id']))
+	fmt = query('SELECT * FROM formats WHERE id = ?', request.values.get('format_id', request.values['format_id']))[0]
 	items = query('''SELECT lectures.*, "video" AS sep, videos.*
 			FROM lectures
 			JOIN courses ON courses.id = lectures.course_id
 			JOIN videos ON lectures.id = videos.lecture_id
 			WHERE courses.id = ? AND videos.video_format = ? AND courses.visible AND lectures.visible AND videos.visible
-			ORDER BY videos.time_created DESC
+			ORDER BY lectures.time DESC
 			LIMIT 100''', course['id'], fmt['id'])
 	chapters = query('SELECT chapters.* FROM chapters JOIN lectures ON lectures.id = chapters.lecture_id WHERE lectures.course_id = ? AND NOT chapters.deleted AND chapters.visible ORDER BY time ASC', course['id'])
 	for item in items: