fix segfault showing an empty remote
In case of an empty list, the search for its tail caused a NULL-pointer dereference. Signed-off-by: NClemens Buchacher <drizzd@aon.at> Reported-by: NErik Faye-Lund <kusmabite@googlemail.com> Acked-by: NJay Soffian <jaysoffian@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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