Strange behaviour of breakbefore option

[Gianluca D.]

Hi everybody!

I'm using lilypond version 2.8.4.

I was trying to use the "breakbefore" option in the "header" block inside 
a "score" to make  the second score of my book start on a new page, but I 
couldn't afford it. 
So, trying on a little test file, I've discovered that "breakbefore" 
apparently works only if "piece" string is set, and this string can't be an 
empty one.
So this header block did not work:

\header  {
  breakbefore = ##t
}

but this one worked:

\header {
  piece = " "
  breakbefore = ##t
}

I think this is really a strange behaviour, since it's quite normal to want a 
score start on a new page even if this score has no piece title.

Best regards,

Gianluca D'Orazio