fix: notification

refactor code to avoid NPE + add missing message.

DLCM-Admin/src/main/java/ch/dlcm/business/NotificationService.java

@@ -240,7 +240,8 @@ public class NotificationService extends ResourceService<Notification> {
         SolidifyEventPublisher.getPublisher().publishEvent(Objects.requireNonNull(emailMessage));
       }
     }
-    if (item.getNotificationType().getNotificationCategory().equals(NotificationCategory.INFO)) {
+    if (item.getNotificationType().getNotificationCategory() != null && item.getNotificationType().getNotificationCategory()
+            .equals(NotificationCategory.INFO)) {
       item.setNotificationStatus(NotificationStatus.NON_APPLICABLE);
     }
     return super.save(item);

DLCM-Common/src/main/resources/locale/messages_dlcm.properties

@@ -464,6 +464,7 @@ notification.status.created=Creation
 notification.status.processed=Processed
 notification.status.pending=Pending
 notification.status.refused=Refused
+notification.status.approved=Approved
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