init: show "Reinit" message even in an (existing) empty repository
Earlier, git-init tested for a valid HEAD ref, but if the repository was empty, there was none. Instead, test for the existence of the file $GIT_DIR/HEAD. Signed-off-by: NJohannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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