fix: no exams in mobility

[limwa]

This PR makes it so uni doesn't try to fetch exams for students with the mobility course or other courses with a null id.

Review checklist

• Terms and conditions reflect the current change
• Contains enough appropriate tests
• If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• Properly adds an entry in changelog.md with the change
• If PR includes UI updates/additions, its description has screenshots
• Behavior is as expected
• Clean, well-structured code

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 12%. Comparing base (cb285d9) to head (4d0205b).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1402   +/-   ##
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- Coverage       12%     12%   -0%     
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  Files          266     266           
  Lines         7239    7240    +1     
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  Hits           806     806           
- Misses        6433    6434    +1     

[limwa]

I can't test this because I don't have a mobility account.
Even then, it's likely that it might not fix the issue.

[thePeras]

I can't test this because I don't have a mobility account. Even then, it's likely that it might not fix the issue.

I think the issue is more complicated than this. Did you check the student account I leave at #uni-reports?

[limwa]

I can't test this because I don't have a mobility account. Even then, it's likely that it might not fix the issue.

I think the issue is more complicated than this. Did you check the student account I leave at #uni-reports?

Nop, I'll check it out now

[thePeras]

The solution I propose:
If mobility course is identified, get exams method maps every enrollment and gets is exams by using the same method of ge course exams because the html page is exactly the same.