[FREE MODULE] Prestashop Vertical dropdown categories menu - How can i hide automatically empty categories?

[iamfablaz 1]

[FREE MODULE] Prestashop Vertical dropdown categories menu from MYPRESTA.EU is great and does the work perfectly. Though i need an option more, how can i change the query to automatically hide the empty categories with no products, or with products but that have inventory quantity = 0.
I'm willing to buy another extension that does the work, or even i'd like to pay the author to modify the query from the php file in the module.
I've found many attempts, but they were for previous versions of PS, like 1.5 and 1.6, and since i know the code changed deeply in 1.7, i would not harm the site i'm not a programmer.
Thanks for any given help.