We did the blow change in fn_get_Categories function
if (!empty($params['get_frontend_urls'])) {
foreach ($categories_list as &$category) {
//$category['url'] = fn_url('categories.view?category_id=' . $category['category_id'], 'C');
// Custom change - To create a mapping of category to the URL created in the Category page (mapping for search resutls)
$url = db_get_field('SELECT url FROM ?:categories WHERE category_id = ?i', $category['category_id']);
if ($url == ''){
$result = fn_url('categories.view?category_id=' . $category['category_id'],'C');
}
else
{
$result = fn_url($url);
}
}
}