public function toOptionArray($noEmpty = false) { $options = parent::toOptionArray($noEmpty); if (!$noEmpty) { if ($options) { $options[0]['label'] = Mage::helper('Mage_Tax_Helper_Data')->__('None'); } else { $options = array(array('value' => '', 'label' => $this->helper('Mage_Tax_Helper_Data')->__('None'))); } } return $options; }
public function toOptionArray($isMultiselect = false) { return parent::toOptionArray(true); }