If a new group is created in Group overview in column 'User count' the number '1' is set automatically. This happens if no student or teacher is enroled for the course.

If one student is added to the group '1' is showed, if two students are in the group '2' is visble.
The field should count only users in the group. If there is no user in the group, the field should be empty or show '0'.

Reproduce
Create a new course
Create a new group in the course
Go to group/overview.php?id=