"Scores" Page for Course Management is not displayed

[rabeatwork]

Describe the bug

The "Scores" page is not displayed. The console throws an error (see below). I should be able to see the Scores page.

To Reproduce

1. Log in as instructor
2. Go to 'Course Management'
3. Click on 'Scores'
4. See error (don't see scores)

This error does not occur in every course. Our course has a team exercise, which could be the main difference from other courses.
I am unsure if it's relevant, but we have a manual assessment for the team exercise, and the due date is past, but the assessment due date is in the future.

Expected behavior

I should be able to see the Scores page.

Screenshots

Which version of Artemis are you seeing the problem on?

7.9.1

What browsers are you seeing the problem on?

Chrome

Additional context

No response

Relevant log output

ERROR TypeError: n is not iterable
    at r.mapStudentIdToStudentStatistics (course-scores.component.ts:486:48)
    at r.calculateStudentLevelStatistics (course-scores.component.ts:410:34)
    at Object.next (course-scores.component.ts:284:18)