app/code/core/Mage/Rating/Block/Entity/Detailed.php

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<?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_Rating
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Entity rating block
 *
 * @category   Mage
 * @package    Mage_Rating
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Rating_Block_Entity_Detailed extends Mage_Core_Block_Template
{
    public function __construct()
    {
        parent::__construct();
        $this->setTemplate('rating/detailed.phtml');
    }

    protected function _toHtml()
    {
        $entityId = Mage::app()->getRequest()->getParam('id');
        if( intval($entityId) <= 0 ) {
            return '';
        }

        $reviewsCount = Mage::getModel('review/review')
            ->getTotalReviews($entityId, true);
        if( $reviewsCount == 0 ) {
            #return Mage::helper('rating')->__('Be the first to review this product');
            $this->setTemplate('rating/empty.phtml');
            return parent::_toHtml();
        }

        $ratingCollection = Mage::getModel('rating/rating')
            ->getResourceCollection()
            ->addEntityFilter('product') # TOFIX
            ->setPositionOrder()
            ->setStoreFilter(Mage::app()->getStore()->getId())
            ->addRatingPerStoreName(Mage::app()->getStore()->getId())
            ->load();

        if ($entityId) {
            $ratingCollection->addEntitySummaryToItem($entityId, Mage::app()->getStore()->getId());
        }

        $this->assign('collection', $ratingCollection);
        return parent::_toHtml();
    }
}

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