page footer and (on-page ...) in combination with \label

[Marc Hohl]

Hello list,

I have lilypond file containing several\bookpart entries.

For one specific page I have to remove the footer completely.
I set

\label #'emptypage

and

oddFooterMarkup = \markup {
  \fill-line { \on-the-fly #last-page \fromproperty #'header:tagline }
  \fill-line { \on-the-fly #print-page-number-check-first
                     \line { My document – \fromproperty 
#'page:page-number-string } } }
evenFooterMarkup = \oddFooterMarkup

I found (on-page ...) but I don't know how I get the page number where 
\label is
placed.

\on-the-fly #(on-page \page-ref #'emptypage)

does not work. Actually, I need something like #(not-on-page ...), but 
this can be
defined in analogy to (on-page ...) in ly/titling.ly.

Any ideas/hints in the right direction are highly welcome!

Regards,

Marc