Hide empty blog post tags

Hi, I am calling post tags in my post.php page:

<?php perch_blog_post_tags(perch_get('s'), 'mis-tags.html'); ?>

but it displays all tags:

- soccer(1)
- baseball ()
- basketball (4)
- rugby ()

Is there any chance to hide those empty tags? Here is my template:

<perch:before><ul class="tags"></perch:before>
        <li><a href="archive.php?tag=<perch:blog id="tagSlug" />" rel="tag"><perch:blog id="tagTitle" /> (<perch:blog id="qty" />)</a></li>
<perch:after></ul></perch:after>

Thanks