Substitution teacher can't see any persons in the lesson view

added part::backend prio::1 source::customer type::bug labels

assigned to @hansegucker

created branch 228-substitution-teacher-can-t-see-any-persons-in-the-lesson-view to address this issue

mentioned in merge request !307 (merged)

closed with merge request !307 (merged)

mentioned in commit 014b21a6