Fixed up support for numeric icon columns with values 0 and 999
Fixed up support for numeric icon columns with values 0 and 999

Those numbers now use /icons/ecblank.gif rather than either a broken
link or a white GIF, respectively.

jesse-gallagher/Domino-One-Offs,jesse-gallagher/Domino-One-Offs,jesse-gallagher/Domino-One-Offs