Thread:Extension talk:CategoryTree/Suppress the display of "no categories" when initial depth is 1

When I display a category tree with an initial depth >1, the extension displays the hint text "no categories" for categories that have no more subcategories. This page on my personal wiki has an example of what I mean (note that the page is made using a template that is a local copy of the Wikipedia template Category_tree_all template).

My question: Is it possible to suppress the "no categories" hint without messing with the extension code? If it's not possible, what would be the simplest way to disable the hint in the code?

BTW: Thanks for this exceedingly cool extension!!!