Filter on missing Album Artist

[Hauzz]

I read TOPIC: FILTER TO SHOW FILES WITH BLANK ALBUM ARTIST and Steven replied with:
    It looks like the special null handling for album artist was removed by mistake some time ago.
     I have put it back in
     https://getmusicbee.com/patches/MusicBee33_Patched.zip
     unzip and replace the existing musicbee application files

I have the latest version installed (updated 3.4 to 3.5) but still it's not possible to filter on missing Album Artist tags.
Am I doing something wrong, or is it really not working?

[hiccup]

A virtual tag like this should display empty for tracks that have no Album Artist:

$IsNull(<Album Artist>,,<Album Artist>)

Or make it something like this:
$IsNull(<Album Artist>,"No Album Artist",<Album Artist>)