Plantafel-Modal für Profile ohne Benutzerzuordnung absichern

frontend/pages/organisation/plantafel.vue

@@ -596,11 +596,17 @@ async function openProfileDetails(profileId) {
   selectedProfile.value = profile
   selectedProfileVacationSummary.value = null
   isProfileDetailsModalOpen.value = true
-  loadingProfileVacation.value = true
 
   const requestId = profileVacationRequestId.value + 1
   profileVacationRequestId.value = requestId
 
+  if (!profile.user_id) {
+    loadingProfileVacation.value = false
+    return
+  }
+
+  loadingProfileVacation.value = true
+
   try {
     const from = `${currentVacationYear.value}-01-01`
     const to = `${currentVacationYear.value}-12-31`