config: report a bug if git_dir exists without commondir
This did happen at some stage, and was fixed relatively quickly. Make sure that we detect very quickly, too, should that happen again. Signed-off-by: NJohannes Schindelin <johannes.schindelin@gmx.de> Reviewed-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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