Handle the case where all roles are removed from a user #1194
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When the last role is removed from a user an exception occurs (BadRequest). It is feasible for a user to not have any roles IMO so this provides a default value in the case where all roles are removed (ie only the csrf is sent in the PUT request). This is a bit of a special case because roles are an array and not a single value (which could be empty) unlike other cases.