In the course copy form if you leave the short name and full name blank the course category field disappears. Even if you cancel and view the form again it stays disappeared. This issue doesn't occur in 4.2.7+ (build 20240516).

Steps to reproduce issue

1. Ensure there is a course to copy.
2. Go to Site administration > Courses > Manage courses and categories.
3. Click the Copy course icon.
4. Click Copy and return leaving both Course full name and Course short name blank.

Expected results

The form is shown again with "Missing full name" and "Missing short name" with the Course category autocomplete field still present.

Actual results

The form is shown again with "Missing full name" and "Missing short name" but the Course category field has disappeared (although the label is still present).