Avoid scary errors about tagged trees/blobs during git-fetch This is the same bug as 42a32174b600f139b489341b1281fb1bfa14c252. The warning "Object $X is a tree, not a commit" is bogus and is not relevant here. If its not a commit we just need to make sure we don't mark it for merge as we fill out FETCH_HEAD. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>