fix for BIESt #977

Merge request studip/studip!562

lib/classes/UserManagement.class.php

@@ -1005,6 +1005,17 @@ class UserManagement
         }
 
         if ($delete_personal_documents && $delete_personal_content && $delete_names && $delete_memberships) {
+            // Delete the user from resource property entries of type "user":
+            ResourceProperty::deleteBySQL(
+                "`property_id` IN (
+                    SELECT `property_id`
+                    FROM `resource_property_definitions`
+                    WHERE `type` = 'user'
+                )
+                AND `state` = :user_id",
+                ['user_id' => $this->user_data['auth_user_md5.user_id']]
+            );
+
             // delete Stud.IP account
             $query = "DELETE FROM user_info WHERE user_id = ?";
             $statement = DBManager::get()->prepare($query);

lib/models/resources/ResourceProperty.class.php

@@ -51,7 +51,7 @@ class ResourceProperty extends SimpleORMap
 
         parent::configure($config);
     }
-    
+
     /**
      * Determines whether this resource property is requestable
      * by checking the requestable flag of the corresponding
@@ -99,7 +99,11 @@ class ResourceProperty extends SimpleORMap
             $string .= $this->state;
         } elseif ($this->type == 'user') {
             $user = User::find($this->state);
-            $string .= $user->getFullName();
+            if ($user) {
+                $string .= $user->getFullName();
+            } else {
+                $string .= _('unbekannt');
+            }
         } else {
             $string .= $this->state;
         }