[C2] Delete course from course_list.php when course is in sequence doesn't work #6814
Description
How to reproduce
- Create 2 courses
- Create a resource sequence with those 2 courses in it
- Go to main/admin/course_list.php
- Try do delete any of those 2 courses
- The page refreshes but the course is not deleted and no error message appears
- Go to one of the courses' home
- Click "Course maintenance" (cog)
- Click "Delete this course" and add the course code and confirm
- An error message appears telling you that the course is included in a sequence and that you need to remove it from there first. This is the desired behaviour.
What to change
Update course_list.php to show the same error message when the course is in a sequence.