Empty staves not removed after one-bar percent repeat

[Peter Crighton]

% Empty staves are not removed after a percent repeat of one bar. Two or more 
bars work fine.

\version "2.16.2"

\paper { ragged-right = ##t }

\layout {
  \context {
    \Staff
    \RemoveEmptyStaves
  }
}

\relative c' {
  \repeat unfold 4 { c1 }
  \break
  R1*4
  \break
  \repeat percent 4 { c1 }
  \break
  R1*4
  \break
  \repeat percent 2 { c1 c }
  \break
  R1*4
}