sirjuddington/SLADE — pull request #116 by eevee (2014-02-13 06:37:41+00:00)
Title: Use "<missing values>" in the sidedef tabs, and show it in gray.

Ambiguous sidedef properties were rendering as blank, because their grids never had their styles updated.

I think it's a common pattern to show faux values in a fainter color? Looks better to me, anyway :)