Anyway, there's that thing, where folders are labeled as size "-" when you hit calc sizes so you know there's nothing in there.
However, if you select a completly empty folder while the Properties panel is showing, it will say "0kb" (or zero whatevers) even if there is absolutly nothing in there. It will even replace the dash from the calculate with a zero.
Actually, this only happens when you have 'show folder sizes in properties panel' selected, so I think i'm going to turn that off for now since I'm keyboarding through things a lot and selecting stuff I don't care about just as I move over it.
But it should probably work the same as that other feature, that would be cool
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