
If a user or group ACL file does not exist in the current tip revision of the acl repository we will get an error from cat-file when we ask for that blob as it cannot be resolved. A quick look at the history by rev-list can tell us if there is a path there or not. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>