Lilypond-book does not produce png

[Michal Vopalensky]

Hi,

I'm using LilyPond 2.8.1 on WinXP and had a horrible time trying to process some
html files containing the lilypond fragments. Everything went OK (after I put
the lilypond-book in function installing Python...), but no png files where ever
generated in the end. I debugged the source code in Python of lilypond-book and
it really seems to me that a line was forgotten somewhere around the line 1398,
under "def process_snippets", or more concretely under "def my_system". Beneath
the line 

if ly_names: my_system (string.join ([cmd, 'snippet-map.ly'] + ly_names))

I think there is missing a line

if png_names: my_system (string.join ([cmd, '-f png', 'snippet-map.ly'] +
png_names))

When I put this line into the source, everything was alright.

Please, can you let me know, if it is possible that this line was forgotten, and
that what I did is right? (never in touch with Python before...)

Thank you,

Michal Vopalensky