Fix 1825: Convert-ly shall also print output if no replacement was done

Fix 1825: Convert-ly shall also print output if no replacement was done

This allows automatically piping ALL files through convert-ly in a script without having to worry that some files don't produce any converted output

[pkx166h, 2011-08-30 21:36:04]

sses make and reg tests and I ran a make doc too (seemed relevant) and it failed

--snip--

tal error: failed files: "78/lily-63af708e.ly"
fatal error: Children (3) exited with errors.
command failed: /home/jlowe/lilypond-git/build/out/bin/lilypond -dbackend=eps
--formats=ps,png,pdf -djob-count=7 -dinclude-eps-fonts -dgs-load-fonts
--header=doctitle --header=doctitlecs --header=doctitlede --header=doctitlees
--header=doctitlefr --header=doctitlehu --header=doctitleit --header=doctitleja
--header=doctitlenl --header=doctitlezh --header=texidoc --header=texidoccs
--header=texidocde --header=texidoces --header=texidocfr --header=texidochu
--header=texidocit --header=texidocja --header=texidocnl --header=texidoczh
-dcheck-internal-types -ddump-signatures -danti-alias-factor=2 -I 
"/home/jlowe/lilypond-git/build/out/lybook-db"  -I 
"/home/jlowe/lilypond-git/build/Documentation"  -I 
"/home/jlowe/lilypond-git/Documentation"  -I 
"/home/jlowe/lilypond-git/build/Documentation/out-www"  -I 
"/home/jlowe/lilypond-git/input"  -I  "/home/jlowe/lilypond-git/Documentation" 
-I  "/home/jlowe/lilypond-git/Documentation/snippets"  -I 
"/home/jlowe/lilypond-git/input/regression"  -I 
"/home/jlowe/lilypond-git/Documentation/included"  -I 
"/home/jlowe/lilypond-git/build/mf/out"  -I 
"/home/jlowe/lilypond-git/build/mf/out"  -I 
"/home/jlowe/lilypond-git/Documentation/pictures"  -I 
"/home/jlowe/lilypond-git/build/Documentation/pictures/out-www" --formats=eps 
--verbose  -deps-box-padding=3.000000  -dread-file-list -dno-strip-output-dir 
"/home/jlowe/lilypond-git/build/out/lybook-db/snippet-names--1067344515.ly"
Child returned 1
make[2]: *** [out-www/notation.texi] Error 1
rm out-www/weblinks.itexi
make[2]: Leaving directory `/home/jlowe/lilypond-git/build/Documentation'
make[1]: *** [WWW-1] Error 2
make[1]: Leaving directory `/home/jlowe/lilypond-git/build'
make: *** [doc-stage-1] Error 2
jlowe@jlowe-lilybuntu2:~/lilypond-git/build$ 

--snip--

I have attached the offending ly file on

http://code.google.com/p/lilypond/issues/detail?id=1825#c3

Hope this is useful.