Resolve "Let next/prev_lesson return None if the person isn't a participant of the lesson"

Closes #110 (closed)

added part::backend type::bug labels

added 1 commit

• b3107932 - Let _adjacent_lesson return None if lesson period is not in list

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assigned to @nik and unassigned @hansegucker

marked this merge request as ready

I do not think this fixes the bug, it merely hides the real issue. The ID the is looked up in the code is the ID of the current lesson, not some adjacent lesson, and it should always be in the list as far as I understand.

resolved all threads

mentioned in commit 2575db50

merged