[fw-mvc] Zion Acl show error action 404 instead of denied action

Hi.
I should show an error/error
instead of a an error/denied action
in case of /nonexistentcontroller
I ended up with this code
public function preDispatch(Zend_Controller_Request_Abstract $request)
{

$response = $this->getResponse();
if($response->isException()){
$this->_request->setModuleName('default');
$this->_request->setControllerName('error');
$this->_request->setActionName('error');
return null;
}
$auth = Zend_Registry::get('auth');
$this->_roleName =
($auth->hasIdentity())?$auth->getIdentity()->role:'guest';


$resourceName = '';

if ($request->getModuleName() != 'default') {
$resourceName .= $request->getModuleName() . ':';
}

$resourceName .= $request->getControllerName();

/** Check if the controller/action can be accessed by the current
user */
if (!$this->getAcl()->isAllowed($this->_roleName, $resourceName,
$request->getActionName())) {
/** Redirect to access denied page */
$this->denyAccess();
}
}

Is it the right way ?
Thanks in advance.
Bye

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