hide empty subcategories on sidebar
i am looking for a possibility to hide empty categories in sidebar on category pages. For instance: on http://www.hunde-fan.de/hundemarkt/h...hundezuechter/
Here are displayed all subcategories (see sidebar on bottom), empty subcategories with(0) ads are displayed as well. I want to hide those links of empty subcategories in order to show only subcategories which have at least one ad.
Can one help me?