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Currently there is only one special error for transaction, for when there is a naming conflict, all other errors are dumped under a generic error. Add a new special error case for when the caller requests the reference to be updated only when it does not yet exist and the reference actually does exist. Signed-off-by: Bence Ferdinandy <bence@ferdinandy.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>