listing heading missing when upgraded to 1.5.7

When we updated to the latest version of Hikashop, the headings on our product listing pages disappeared.

We changed the following code in our product / listing.php template override file and the listing page headings reappeared and seem to be displaying as before.

if(version_compare(JVERSION,'1.6','<')){
$title = 'show_page_title';
}else{
$title = 'show_page_heading';

}

To make our page headings work again we changed the code to:

if(version_compare(JVERSION,'1.6','<')){
$title = 'show_page_title';
}else{
//$title = 'show_page_heading';
$title = 'menu_text';

}


Not sure if our work around fixed a bug in the new release or if it simply worked around something else we were doing wrong in our configuration.