GUB failing tests

[Graham Percival]

I've done
    make -f lilypond.make bootstrap
without problems, and
    make lilypond
builds all the arches.  The test output tarball is created, but it
fails the rsync test (?)


-----  (output from "make lilypond")
make[3]: Entering directory `/home/lilypond/gub'
PYTHONPATH=/home/lilypond/gub/target/linux-x86/build/lilypond-git.sv.gnu.org--lilypond.git-master/python/out
\
        python test-lily/rsync-test.py \
                
--version-file=/home/lilypond/gub/target/linux-x86/build/lilypond-git.sv.gnu.org--lilypond.git-master/out/VERSION
\
                
--output-distance=/home/lilypond/gub/target/linux-x86/src/lilypond-git.sv.gnu.org--lilypond.git-master/scripts/build/output-distance.py
\
                --test-dir=uploads/webtest
uploads/lilypond-2.13.2-HEAD.test-output.tar.bz2
Traceback (most recent call last):
  File "test-lily/rsync-test.py", line 199, in <module>
    main ()
  File "test-lily/rsync-test.py", line 193, in main
    compare_test_info (options)
  File "test-lily/rsync-test.py", line 154, in compare_test_info
    assert 0
AssertionError
make[3]: *** [unlocked-test-export] Error 1
make[3]: Leaving directory `/home/lilypond/gub'
-----


The relevant lines of python are:
-----
def compare_test_info (options):
...
    for f in outputs:
        m = re.search ('lilypond-([.0-9]+)-([0-9]+).test-output.tar.bz2', f)
        if not m:
            printf (f)
            assert 0
-----

which makes sense, since there aren't any previous test outputs on
the system.  However, I can't see any special mention of this in
the README, or in "make help".  What should I do?

Cheers,
- Graham