Compared.php

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<?php
namespace Magento\Reports\Block\Product;

class Compared extends \Magento\Reports\Block\Product\AbstractProduct
{
    const XML_PATH_RECENTLY_COMPARED_COUNT = 'catalog/recently_products/compared_count';

    protected $_indexType = \Magento\Reports\Model\Product\Index\Factory::TYPE_COMPARED;

    public function getPageSize()
    {
        if ($this->hasData('page_size')) {
            return $this->getData('page_size');
        }
        return $this->_scopeConfig->getValue(
            self::XML_PATH_RECENTLY_COMPARED_COUNT,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    protected function _toHtml()
    {
        if (!$this->getCount()) {
            return '';
        }

        $this->setRecentlyComparedProducts($this->getItemsCollection());

        return parent::_toHtml();
    }
}