/**
  * {@inheritdoc}
  */
 public function isEmpty()
 {
     $pluginInfo = $this->pluginList->getNext($this->subjectType, 'isEmpty');
     if (!$pluginInfo) {
         return parent::isEmpty();
     } else {
         return $this->___callPlugins('isEmpty', func_get_args(), $pluginInfo);
     }
 }