<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    Mage
 * @package     Mage_Adminhtml
 * @copyright   Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Backend for serialized array data
 *
 */
class Mage_Adminhtml_Model_System_Config_Backend_Serialized_Array extends Mage_Adminhtml_Model_System_Config_Backend_Serialized
{
    /**
     * Unset array element with '__empty' key
     *
     */
    protected function _beforeSave()
    {
        $value = $this->getValue();
        if (is_array($value)) {
            unset($value['__empty']);
        }
        $this->setValue($value);
        parent::_beforeSave();
    }
}