\paper {
	EmptyStaff = \translator  {
		\type "Engraver_group_engraver"
		\name "EmptyStaff"
	}
}

\score{
<
	\context Staff = "foo" \notes { c'4 d' e' f' | g' f' e' d' }
	\context EmptyStaff = "bar" \notes { s1 | s1 }
	\context Staff = "baz" \notes { g'4 f' e' d' | c' d' e' f' }
>
	\paper {
		\translator  {
			\EmptyStaff
			\consists "Staff_symbol_engraver"
		} 
	} 
}