hotfix 0 sks

backend/src/util/db/course-class-meeting.js

@@ -55,6 +55,7 @@ const getCourseClassMeetingByLecturerId = async (opts = {}) => {
 }
 
 const getCourseClassMeetingByCourseClassIds = async (courseClassIds) => {
+    if (!courseClassIds.length) return [];
     try {
         const courseClassMeetings = await CourseClassMeeting.findAll({
             where : {