(Untested) Add a GREP style to the paragraph style used in the cells that sets your 'white' (*) color with a character style. Use this GREP:
(*) It's better not to use a literal color "white", but "None" instead. "White" will insert white text in your document -- visible if you add a background color, and selectable in your PDF. "None" will insert nothing.
Ah. The GREP looks for (start of paragraph) (any positive number of (digit or period)) (slash). The last column also contains a comma
Change the GREP to this and you should be allright:
(there's a comma added inside the square brackets)