Filter out unused subcategories? [SOLVED]

Hi,

I'm using a solution originally posted by dazglaser and answered by @hus_hmd and ryan

The code provides the ability to use different templates based on the subcategory level. This gives similar template options as the <perch:pages id="subitems" encode="false" /> but for subcategories.

It works great, but currently it displays all subcategories.

I'd like to be able to filter out any subcategories that aren't assigned to an item/post.

I usually achieve this by using this code:

Then in the template.html, I use a perch:if

Here's the code from the original post:

How would I modify this code to filter out any subcategories that aren't assigned to an item/post?

Solved.