List empty sub-categories

Hi,
before I wrote this I checked different topics however
I did’t find the answer.
I have to list categories even if they are empty. I use this code

$args = array('hide_empty'=>0, 'child_of' => 2,'pad_counts' => true);
$categories = get_categories( $args );

?>
<div class="mk_hidden_menu">
<ul>
<?php
foreach($categories as $category)
{
echo '<li class="mk_second_navigation_block"><a class="mk_second_navigation_a" href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a> </li> ';
}
?>
</ul>
</div>

It list sub-categories name only if there are not empty. Option ‘hide_empty’=>0 doesn’t change anything I read documentation and similar topics. For most of ‘us’ ‘hide_empty’=>0 solve it, but not this time
Any help?