In case the file's \version is recent enough, convert-ly doesn't emit
anything. This is bad. Instead, it should copy the file verbatim to
stdout, as it was done previously.
A trivial example to demonstrate it is a file xxx.ly which only
contains
\version "2.9.28"
After saying
convert-ly xxx.ly > yyy.ly
you just see
convert-ly (GNU LilyPond) 2.9.28
Processing `xxx.ly'...
Applying conversion:
and yyy.ly is empty.
On the other hand, if you have
\version "2.8.28"
you see
convert-ly (GNU LilyPond) 2.9.28
Processing `xxx.ly'...
Applying conversion: 2.9.4, 2.9.6, 2.9.9, 2.9.11, 2.9.13, 2.9.16, 2.9.19
and yyy.ly contains
\version "2.9.19"
In case it matters, my Python is version 2.4.1.
Werner
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