tests: fix spurious error when run directly with Solaris /usr/xpg4/bin/sh
If any test script is run directly with Solaris 10 /usr/xpg4/bin/sh or /bin/ksh, it fails spuriously with a message like: t0000-basic.sh[31]: unset: bad argument count This happens because those shells bail out when encountering a call to "unset" with no arguments, and such unset call could take place in 'test-lib.sh'. Fix that issue, and add a proper comment to ensure we don't regress in this respect. Signed-off-by: NStefano Lattarini <stefano.lattarini@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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