partial measure plus tuplet causes incorrect bar check warning with tripletFeel

[Eric Benson]

Here's a minimal example:

\include "swing.ly"


\score {

  \tripletFeel 8 {

    \partial 8 e8 | a2. \tuplet 3/2 { e8 e8 e8 } |

  }

  \midi{}
}

produces

xx.ly:5:19: warning: bar check failed at: 1/24