cakephpでNoticeエラーを表示させないようにするには

cakephpのdefault.ctpでナビゲーションをユーザーがログインしているか否かで
処理を分けてます。

↓条件分岐の一文↓

<?php if(is_null($user)) : ?>

php
1<?php
2/**
3 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
4 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
5 *
6 * Licensed under The MIT License
7 * For full copyright and license information, please see the LICENSE.txt
8 * Redistributions of files must retain the above copyright notice.
9 *
10 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
11 * @link          http://cakephp.org CakePHP(tm) Project
12 * @package       app.View.Layouts
13 * @since         CakePHP(tm) v 0.10.0.1076
14 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
15 */
16
17
18?>
19<!DOCTYPE html>
20<html>
21<head>
22	<?php echo $this->Html->charset(); ?>
23	<title>
24		<?php echo $this->fetch('title'); ?>
25	</title>
26	<?php
27		echo $this->Html->meta('icon');
28
29		echo $this->Html->css( 'reset.css');
30		echo $this->Html->css( 'postlist.css');
31
32		echo $this->fetch('meta');
33		echo $this->fetch('css');
34		echo $this->fetch('script');
35	?>
36</head>
37<body>
38	<div id="container">
39		<div id="header">
40			<h1></h1>
41		</div>
42		<?php if(is_null($user)) : ?>
43			<nav>
44			<ul>
45			  <li><?php echo $this->Html->link('ホーム', array('action' => 'postlist')); ?></li>
46			  <li><?php echo $this->Html->link('日記一覧', array('action' => 'postlist')); ?></li>
47			  <li><?php echo $this->Html->link('ログアウト', array('action' => 'logout')); ?></li>
48			</ul>
49			</nav>
50		<?php else: ?>
51			<nav>
52			<ul>
53			  <li><?php echo $this->Html->link('ホーム', array('action' => 'postlist')); ?></li>
54			  <li><?php echo $this->Html->link('日記一覧', array('action' => 'postlist')); ?></li>
55			  <li><?php echo $this->Html->link('日記追加', array('action' => 'add')); ?></li>
56			  <li><?php echo $this->Html->link('ログアウト', array('action' => 'logout')); ?></li>
57			</ul>
58			</nav>
59  	<?php endif; ?>
60
61		<div id="content">
62
63			<?php echo $this->Flash->render(); ?>
64
65			<?php echo $this->fetch('content'); ?>
66		</div>
67	</div>
68</body>
69</html>