SkipBars

[Rune Zedeler]

This example should illustrate my problem:

akk = \chords { c1 f g c c f g c }
mus = \notes \transpose c''' { c4 e g e c2 r2 R1*4 r4 d f d c1 }
\score {
    <
        \property Score.skipBars = ##t
        \context ChordNames \akk
        \context Staff \mus
    >
    \paper {}
}


Ofcourse one should imagine that this is an extract of a larger piece 
with lots of voices. I would like to replace the whole rests with one 
mm-rest. However the chord-names disallows me in doing so. Is it 
possible to automatically turn off chord names (and lyrics) Whenever 
there are only mm-rests present in the music?

-Rune