/**
  * Find attribute value which will be considered as a default if attribute has not specific default value
  *
  * @param array $data Data to search: array('product' => ..., 'attribute' => ...)
  *
  * @return \XLite\Model\AttributeValue\AAttributeValue
  */
 public function findDefaultAttributeValue($data)
 {
     $data['value'] = 0;
     return parent::findDefaultAttributeValue($data);
 }