is there a \RemoveEmptyLyrics

[Kieren MacMillan]

Hello all,

I'm using the latest development version.

I have a choral score where the soloist alternately sings alone and joins the 
chorus sopranos. I'm successfully using \RemoveEmptyStaves in conjunction with

    letStaffVanish = \set Staff.keepAliveInterfaces = #'()
    showStaff = \unset Staff.keepAliveInterfaces

to get the correct "french-ing" of my score… but the lyrics still show up!

Is there a \RemoveEmptyLyrics?
Ultimately, could we simply have a \RemoveEmptyContext instead of the specific 
\RemoveEmptyStaves?

Thanks,
Kieren.

p.s. One day, when I'm less pressured to crank out scores, i'd love to 
consolidate all of this information (regarding French-ing) into a single, clear 
bit of documentation.