FII viz 2 - consider how to handle missing veg type

Jeffrey noted that not all sections of the core that have biomass markers (L, M, and or G) are matched to a vegetation type, b/c L/(M+G) sometimes falls below the range of grasses, softwood, or hardwood. He points out the viewer could be confused, wondering what vegetation type was burned if it was uncategorized.

Consider while refining viz