Bug report for 1.4.1: Part extraction

[Amelie Zapf]

Hi folks,

I'm routinely typesetting jazz quintet scores with Lily and do the part
extraction for the individual players by "commenting out" the other voices.

So, now I had a score that compiled o.k., but when I extracted the vocal + chord
symbols, I got the following message:

lilypond: ../flower/include/interval.hh:28: Real Interval_t<double>::center():
Zusicherung »!empty_b ()« nicht erfüllt.
Fehler: lilypond: command exited with value 6
Traceback (most recent call last):
  File "/usr/local/bin/ly2dvi", line 770, in ?
    run_lilypond (files, outbase, dep_prefix)
  File "/usr/local/bin/ly2dvi", line 387, in run_lilypond
    system ('lilypond %s %s ' % (opts, fs))
  File "/usr/local/bin/ly2dvi", line 312, in system
    error (msg)
  File "/usr/local/bin/ly2dvi", line 205, in error
    raise _ ("Exiting ... ")
Exiting ...

The extraction of bass and drum parts works, the piano also fails. Tenor Sax
tacet in this one, so it's just four.

Anybody knows that problem?

Amy