When creating users through the Public API if on the $parentGroups parameter there are some 'incorrect' IDs it will be assigned to them any way.

UserService::loadUserGroup

Steps:

1. go to the admin interface
2. create a folder and get it's object ID (<folder-id>)
3. create an image and get it's object ID (<image-id>)
4. load the groups using public API

       $userService->loadUserGroup( <folder-id> );
       $userService->loadUserGroup( <image-id> );
   

5. Verify that the expected exception was not thrown in either cases