Fix describe --tags --long so it does not segfault
If we match a lightweight (non-annotated tag) as the name to output and --long was requested we do not have a tag, nor do we have a tagged object to display. Instead we must use the object we were passed as input for the long format display. Reported-by: NMark Burton <markb@ordern.com> Backtraced-by: NMikael Magnusson <mikachu@gmail.com> Signed-off-by: NShawn O. Pearce <spearce@spearce.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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