Disable Gravatar for Mautic

GravatarHelper.php

<?php

/*
 * @copyright   2014 Mautic Contributors. All rights reserved
 * @author      Mautic
 *
 * @link        http://mautic.org
 *
 * @license     GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 */

namespace Mautic\CoreBundle\Templating\Helper;

use Mautic\CoreBundle\Factory\MauticFactory;
use Mautic\CoreBundle\Helper\UrlHelper;
use Mautic\LeadBundle\Templating\Helper\AvatarHelper;
use Symfony\Component\Templating\Helper\Helper;

/**
 * Class GravatarHelper.
 */
class GravatarHelper extends Helper
{
    /**
     * @var bool
     */
    private $devMode;

    /**
     * @var array
     */
    private $devHosts = [];

    /**
     * @var
     */
    private $imageDir;

    /**
     * @var AssetsHelper
     */
    private $assetHelper;

    /**
     * @var AvatarHelper
     */
    private $avatarHelper;

    /**
     * @var null|\Symfony\Component\HttpFoundation\Request
     */
    private $request;

    /**
     * @param MauticFactory $factory
     */
    public function __construct(MauticFactory $factory)
    {
        $this->devMode      = $factory->getEnvironment() == 'dev';
        $this->imageDir     = $factory->getSystemPath('images');
        $this->assetHelper  = $factory->getHelper('template.assets');
        $this->avatarHelper = $factory->getHelper('template.avatar');
        $this->request      = $factory->getRequest();
        $this->devHosts     = (array) $factory->getParameter('dev_hosts');
    }

    /**
     * @param string $email
     * @param string $size
     * @param string $default
     *
     * @return string
     */
    public function getImage($email, $size = '250', $default = null)
    {
        return 'https://www.mautic.org/media/images/default_avatar.png' :
        // 任意の人物アイコン画像ファイルに置き換え
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'gravatar';
    }
}