Fixed vhostsubdomain not empty regex check to allow 1 char subdomains.

Till Brehm

2014-02-17 baa7f2736bc91ca3feaed685e8a67a46db4fbb98

 interface/lib/classes/auth.inc.php

@@ -33,6 +33,7 @@

   public function get_user_id()
   {
      global $app;
      return $app->functions->intval($_SESSION['s']['user']['userid']);
   }