/**
* Get the subscribers last name with fallback to customer data
*
* @return string
*/
public function getSubscriberLastname()
{
$lastname = parent::getSubscriberLastname();
if (!$lastname && Mage::getStoreConfig('newsletterextended/fields/customer_fallback') && $this->getCustomer()) {
$lastname = $this->getCustomer()->getLastname();
}
return $lastname;
}
