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1 node graphs might have no directed edges. 2 node graphs might only have one pair. I think I have seen this behaviour but I can't remember where. Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz> Reviewed-by: Garming Sam <garming@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>