Comment #4 on issue 1463 by [email protected]: 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)
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