Chord names vertical spacing problem (since 2.14?)

[Chani]

Hello,

I have a problem with the vertical spacing of multiple lines containing 
only chord names. 
They used to be very close to each other, now it seems that it
leaves a 
blank vertical space between lines (as if there was a staff in between).
I think (but I might be wrong) that it only happens since 
I have updated to 2.14.2.

Here is a tiny example :

\chords {
  c4:min f:min7
  \break
  c4:min f:min7
}