Fixed MANTIS-4649 (Notifications may not send)

    public function run()

    {

        if (!GOOGLE_APPENGINE) { // GAE has its own external task queue

            $task_rows = $GLOBALS['SITE_DB']->query_select('task_queue', array('*'), array('t_locked' => 0));

            if (!empty($task_rows)) {

                require_code('tasks');

                require_code('notifications'); // Needed as a task may require the notification object, and any class that has a deserialized reference needs to be loaded first to avoid being an 'incomplete object'

            }

            $task_rows = $GLOBALS['SITE_DB']->query_select('task_queue', array('*'), array('t_locked' => 0));

            foreach ($task_rows as $task_row) {

                $GLOBALS['SITE_DB']->query_update('task_queue', array(

                    't_locked' => 1,