Make rdiff-backup_testfiles.fix.sh idempotent.#2
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When running `rdiff-backup_testfiles.fix.sh` multiple times, `chown` and/or `chgrp` will eventually fail as they will be called without any argument. This change ensures that if `find` does not find any file, `xargs` does not run `chown`/`chgrp`.
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When running
rdiff-backup_testfiles.fix.shmultiple times,chownand/orchgrpwill eventually fail as they will be called without any argument. This change ensures that iffinddoes not find any file,xargsdoes not runchown/chgrp.