Issue 767 in lilypond: Harmonic collisions may break compiling

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Comment #2 on issue 767 by n.puttock: Harmonic collisions may break  
compiling
http://code.google.com/p/lilypond/issues/detail?id=767

Two workarounds, depending on whether you want dots on harmonics:

<<
{ r4 b''2. } \\
{ e'2.  } \\
{ <fis'\harmonic>2*3/2 }


<<
{ r4 b''2. } \\
{ e'2.  } \\
{ \set harmonicDots = ##t <fis'\harmonic>2. }


The note-collision-interface wants to move the dot to the right, but the
New_fingering_engraver has called suicide () on it, so trying to retrieve  
the
dot-count fails by returning an empty list (which can't be converted to  
int).

The simplest fix seems to be to use robust_scm2int in  
Rhythmic_head::dot_count:

int
Rhythmic_head::dot_count (Grob *me)
{
  return get_dots (me)
    ? robust_scm2int (get_dots (me)->get_property ("dot-count"), 0) : 0;
}

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