beforeRender() condition in app_controller.php stops CakeError instances

In app_controller.php in the beforeRender() we have this:

if($req != 'Page') // Page doesn't have an actual model
$model = $this->$req;

It should instead be

if($req != 'Page' and $req != 'CakeError') // Page doesn't have an actual model
$model = $this->$req;

so that instances of CakeError can "get through".