Condensed Scores

[benory]

This follows up on the discussion: rism-digital/verovio#3253.

A number of scores that I would like to add to my project (both mass movements with multiple sections and motets with multiple partes) have tacet voices for particular sections (e.g., Jean Richafort's Salve regina, which is in five voices, but has a secunda pars with four voices). How do I hide the empty staves in the reduced texture sections?