BUG: Assignments Index Inaktiv Filter crashes
https://trello.com/c/1vRZav4S/153-bug-assignments-index-inaktiv-filter-crashes
Alle & Aktiv seems working, but on Inaktiv it's crashing. https://staging.aoz-freiwillige.ch/assignments?q%5Binactive%5D=true
ActionView::Template::Error (undefined method `empty?' for nil:NilClass):
8: - if controller_name != 'volunteers'
9: td = link_to_if policy(assignment.volunteer).show?, assignment.volunteer, assignment.volunteer
10: - if controller_name != 'clients'
11: td= link_to_if policy(assignment.client).show?, assignment.client, assignment.client
12: td= l(assignment.period_start) if assignment.period_start
13: td= l(assignment.period_end) if assignment.period_end
14: td= link_to_if policy(User).show?,