Update script for init.php 134

Hello,

We updated the server to php8 MariaDB 1.4
And a warning came:
Warning: Undefined array key “menu” in wp-content/plugins/conditional-menus/init.php on line 134

We fixed it by changing line 134 to:

if( !isset($new_menu['menu']) || $new_menu['menu'] == '' || $new_menu['condition'] == '' ) {
							continue;
						}