LilyPond remove empty staves

In recent versions of LilyPond \RemoveEmptyStaffContext has been changed to ...

\layout {

   \context {

     \Staff

     \RemoveEmptyStaves

     % To use the setting globally, uncomment the following line:

     % \override VerticalAxisGroup #'remove-first = ##t

   }

}

... though it remains to be seen whether \RemoveEmptyStaffContext is deprecated or not.