fixed issue with namespace AND fixed issue #649

lib/Cron/Workers/Scheduler.php

@@ -1,6 +1,4 @@
 <?php
-if(!defined('ABSPATH')) exit;
-
 namespace MailPoet\Cron\Workers;
 
 use Carbon\Carbon;
@@ -12,9 +10,9 @@ use MailPoet\Models\SubscriberSegment;
 use MailPoet\Util\Helpers;
 use MailPoet\Newsletter\Scheduler\Scheduler as NewsletterScheduler;
 
+if(!defined('ABSPATH')) exit;
 require_once(ABSPATH . 'wp-includes/pluggable.php');
 
-
 class Scheduler {
   public $timer;
   const UNCONFIRMED_SUBSCRIBER_RESCHEDULE_TIMEOUT = 5;