Anything with a line break still causes a crash. I can't say exactly
why, because I'm a bit confused which VerticalAxisGroup gets removed,
the outer or the inner.
\new StaffGroup \with { \RemoveEmptyStaves
} << { b1 b1 b1}
{ b1 b1 \break b1 } >>
My only suggestion is to merge "Axis_group_engraver" with
"Hara_kiri_engraver" engraver (and give it a sensible name like
"Line_engraver") but that is much more work.
https://codereview.appspot.com/7069044/
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