Re: Issue 1463 in lilypond: Writing metadata to the PDF file

[lilypond]

Comment #4 on issue 1463 by address@hidden: Writing metadata to the  
PDF file
http://code.google.com/p/lilypond/issues/detail?id=1463

Reinhold, this patch breaks files which don't have a header block.  You  
need to validate the existence of the header before calling  
`handle-metadata', i.e., either

(if (module? header) ...)

or

(if header ...) (assuming ly:paper-book-header is changed to return #f if  
the header doesn't exist)