don't require special delete_absence permission to delete

emissions/views.py

@@ -295,7 +295,7 @@ class EmissionAddAbsenceView(CreateView):
 
 class AbsenceDeleteView(RedirectView):
     def get_redirect_url(self, emission_slug, pk):
-        if not self.request.user.has_perm('emissions.delete_absence'):
+        if not self.request.user.can_manage(emission):
             raise PermissionDenied()
         Absence.objects.filter(id=pk).delete()
         messages.success(self.request, SUCCESS_MESSAGE)