Re: [Lilypond-auto] Issue 3161 in lilypond: Patch: Standardizes use of empty extents in pure heights and skylines.

[lilypond]

Comment #6 on issue 3161 by mts...@gmail.com: Patch: Standardizes use of  
empty extents in pure heights and skylines.
http://code.google.com/p/lilypond/issues/detail?id=3161#c6
Adds regtest.

http://codereview.appspot.com/7310075