get_local_heads(): do not return random pointer if there is no head
it's silly to do this: mkdir foo && cd foo && git init && git push somewhere.git but segfault should not happen even in that case. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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