Re: [Lilypond-auto] Issue 2981 in lilypond: Let \set ... = *undefined* unset values rather than overwriting

[lilypond]

Updates:
        Summary: Let \set ... = *undefined* unset values rather than overwriting
Comment #5 on issue 2981 by d...@gnu.org: Let \set ... = *undefined* unset  
values rather than overwriting
http://code.google.com/p/lilypond/issues/detail?id=2981

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