private function checkForm($form, Timeslot $timeslot)
 {
     if ($form->isValid()) {
         if ($timeslot->getName() == null || trim($timeslot->getName()) == '') {
             $form->addError(new FormError($this->get('translator')->trans('FORM.TIMESLOT.NONAME', array(), 'admin')));
             return false;
         }
         return true;
     }
     return false;
 }