Comment #3 on issue 2836 by [email protected]: LilyPond hangs if NoteHead 'stencil is empty
http://code.google.com/p/lilypond/issues/detail?id=2836
Regarding comment #2 "Probably we should be robust to missing stencils, avoid generating NaNs.": definitely. Falsifying a stencil as well as killing a grob are operations commonly useful as a user-induced action. Neither should catch us on the wrong foot.
