! Wess didn't allow @if tests to evaluate lone variables as boolean if they were set to an empty string (e.g. $window_bg = '', @if $window_bg background: $window_bg @endif didn't work), while 'false' and '0' values worked fine. I like single-byte fixes. (Class-CSS.php)

! Still in Wess, non-math() functions were only allowed to use unit-less parameters, e.g. with $var = 6px, math($var / 3) was allowed, but round(math($var / 3)) wouldn't work because it was parsed to round(2px). It should now properly return '2px'. (Class-CSS.php)
* Also applied previous emptiness fix to @elseif commands. (Class-CSS.php)

! Empty @elseif commands were internally seen as empty strings and explicitly seen as 'true', when I should have set them to 'true' directly, and ensured that an empty string is a no-go. This is more logical. (Class-CSS.php)

+ Wess will now automatically dismiss properties with empty contents. For instance, "background: $bg" no longer needs to be enclosed in an "@if $bg" test to ensure skinners can disable the background. Please note that @if $bg would still be necessary in situations where the property uses the variable but adds something else to it, for instance "background: $bg, $bg2" or something like that. (Class-CSS.php)

@ I've updated my CSS files to reflect this change, but they're not ready for commit right now, so it'll have to wait more.
! Wrong language string. (ModerationCenter.template.php)
! Wow, a CSS typo! Woot! (mana.css)
! Moved topic notifications weren't outputting the proper URL in e-mails. (notifiers/Move.php)