t9143: do not fail when unhandled.log.gz is not created

t9143 fails on my system because a unhandled.log.gz is created, even if perls Compress::Zlib is missing.
Instead of relying on svn using perl and its Zlib to generate a .gz file, simply check if the .gz file had been created. Now we do not depend on internal implementation details of svn. And the code is 3% easier to understand :-)

*** BLURB HERE ***

Torsten Bögershausen (1):
t9143: do not fail when unhandled.log.gz is not created

 t/t9143-git-svn-gc.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)