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If the user has no branches at all (their refs/heads/ is empty) and they are on a detached HEAD we have a valid repository but there are no branches to populate into the branch pulldown in the create branch dialog. Instead of erroring out we can skip that part of the dialog, much like we do with tracking branches or tags when the user doesn't have any. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>