feat(schedule-import): define depublishing as default case

src/core/models/schedules.py

@@ -439,11 +439,12 @@ class ScheduleSource(models.Model):
             }
 
             # check if we should do something about the missing event
-            if missing_events == 'depublish':
-                Event.objects.filter(pk=event_id).update(is_public=False, room=None)
-            elif missing_events == 'delete':
+            match missing_events:
+                case 'delete':
                     Event.objects.filter(pk=event_id).delete()
                     act['action'] = 'deleted'
+                case ['depublish', _]:
+                    Event.objects.filter(pk=event_id).update(is_public=False, room=None)
 
             activity.append(act)