From 64284f46930b812cf3b74557fb9256f01ecaef79 Mon Sep 17 00:00:00 2001
From: jdlrobson <jdlrobson@gmail.com>
Date: Wed, 30 Dec 2020 16:38:36 -0800
Subject: [PATCH] `id` may not be defined so check

e.g.
```
$wgHooks['SidebarBeforeOutput'][] = function ( $skin, &$bar ) {
        # note: heading can be either a message key. If no message exists it will be treated as a plain
 text.
        $bar[ 'sunday' ] = [
                [
                        'label' => 'msg-myid',
                        'msg' => 'my-label-message',
                        'href' => '//example.com'
                ]
        ];
};
```

Fixes: #212
---
 src/Components/NavMenu.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Components/NavMenu.php b/src/Components/NavMenu.php
index e384ccc3..b961adbb 100644
--- a/src/Components/NavMenu.php
+++ b/src/Components/NavMenu.php
@@ -114,8 +114,9 @@ protected function buildMenuItemsForDropdownMenu( $menuDescription, $indent = 0
 			$this->indent( $indent );
 
 			foreach ( $menuDescription['content'] as $key => $item ) {
+				$id = $item['id'] ?? '';
 				$menuitems .= $this->indent() . $this->getSkinTemplate()->makeListItem( $key, $item,
-					[ 'tag' => 'div', 'class' => 'nav-item', 'link-class' => 'nav-link '.$item['id'] ] );
+					[ 'tag' => 'div', 'class' => 'nav-item', 'link-class' => 'nav-link '. $id ] );
 			}
 
 			$this->indent( - $indent );