Disallow cyclic group graphs
Disallow cyclic group graphs

Thanks to the magic of the ancestry plugin, this is now forbidden
without any additional work.

ministryofjustice/peoplefinder,ministryofjustice/peoplefinder,heathd/moj_peoplefinder,MjAbuz/peoplefinder,heathd/moj_peoplefinder,MjAbuz/peoplefinder,MjAbuz/peoplefinder,ministryofjustice/peoplefinder,MjAbuz/peoplefinder,ministryofjustice/peoplefinder,ministryofjustice/peoplefinder