Enhance nobility ID validation in FalukantService

- Added checks to ensure that provided nobility IDs are valid and exist in the database, improving error handling and user feedback.
- Updated logic to use loaded nobility objects when adding invited nobilities to a party, optimizing database interactions.

backend/services/falukantService.js

@@ -2821,9 +2821,15 @@ class FalukantService extends BaseService {
         if (!ptype || !music || !banquette) {
             throw new Error('Ungültige Party-, Musik- oder Bankett-Auswahl');
         }
-        const nobilities = nobilityIds.length
+        const nobilities = nobilityIds && nobilityIds.length
             ? await TitleOfNobility.findAll({ where: { id: { [Op.in]: nobilityIds } } })
             : [];
+        
+        // Prüfe, ob alle angegebenen IDs gefunden wurden
+        if (nobilityIds && nobilityIds.length > 0 && nobilities.length !== nobilityIds.length) {
+            throw new Error('Einige ausgewählte Adelstitel existieren nicht');
+        }
+        
         let cost = (ptype.cost || 0) + (music.cost || 0) + (banquette.cost || 0);
         cost += (50 / servantRatio - 1) * 1000;
         const nobilityCost = nobilities.reduce((sum, n) => sum + ((n.id ^ 5) * 1000), 0);
@@ -2848,8 +2854,9 @@ class FalukantService extends BaseService {
             servantRatio,
             cost: cost
         });
-        if (nobilityIds.length) {
-            await party.addInvitedNobilities(nobilityIds);
+        if (nobilities.length > 0) {
+            // Verwende die bereits geladenen Objekte
+            await party.addInvitedNobilities(nobilities);
         }
         const user = await User.findByPk(falukantUser.userId);
         notifyUser(user.hashedId, 'falukantPartyUpdate', {