fast-export: report SHA-1 instead of gibberish when marks exist already
fast-export: report SHA-1 instead of gibberish when marks exist already

Cc: Pieter de Bie <3e6d94fbbdfd4509f62934e39a0cf25eb755747e@ai.rug.nl>
Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>
Signed-off-by: Max Horn <0706025b2bbcec1ed8d64822f4eccd96314938d0@quendi.de>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git