Crash with Completion_heads_engraver and a bare duration

[Simon Albrecht]

Hello,

the following code crashes:

%%%%%%%%%
\version "2.19.36"
\layout {
  \context {
    \Voice
    \remove "Note_heads_engraver"
    \consists "Completion_heads_engraver"
  }
}
{ \breve }
%%%%%%%%%

Removing Note_heads_engraver is not essential to triggering the bug.

Best, Simon

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