Trade site: not possible to search for open prefix/suffix any more?

I don't see it in any of the options. Have gone through them many times. Either I'm blind, or has it been removed?

Combined with a count filter group, this would have been great to still have present. Anybody know how to do it?

Edit: Never mind, I found it. Am sure it used to be part of the filters on the left side, but it's a drop down option now. Finally found it as "# prefix modifiers"

The correct term on the trade site is '# Empty' modifiers. Just search 'empty' in the stat filter and you will see them.

Well I learned something today, thanks a lot !