/**
* Get the subscribers dob (date of birth) with fallback to customer data
*
* @return string
*/
public function getSubscriberDob()
{
$dob = parent::getSubscriberDob();
if (!$dob && Mage::getStoreConfig('newsletterextended/fields/customer_fallback') && $this->getCustomer()) {
$dob = $this->getCustomer()->getDob();
}
return $dob;
}
