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