lesson

src/main/java/de/jottyfan/bico/modules/slot/SlotService.java

@@ -36,4 +36,8 @@ public class SlotService {
 	public SlotBean loadDeletableSlot(Integer id) {
 		return repository.getSlotIfDeletable(id);
 	}
+
+	public Boolean slotHasLesson(Integer id) {
+		return id == null ? false : repository.getHasLesson(id);
+	}
 }