Exercise: Edit button of empty does not work

[HawKhiem]

Describe the bug

The Edit button of an empty team does not work

To Reproduce

1. Go to 'Teams' of any team exercise
2. Remove all team members of the team but don't delete the team itself
3. Click on Edit
4. See error

Expected behavior

The Edit button should work as usual

Screenshots

Which version of Artemis are you seeing the problem on?

8.0.0

What browsers are you seeing the problem on?

Other (specify in "Additional context")

Additional context

Brave

Relevant log output