Ansible/RHN: cannot marshal None unless allow_none is enabled

Latest response 
TASK [rhn : Register to RHN Server using 3-dev-rhel-x86_64-server-7-key] *********************************************
fatal: [atllvdopap650d]: FAILED! => {"changed": false, "failed": true, "msg": "Failed to register with 'atlsatrh01c.hughestelematics.net': cannot marshal None unless allow_none is enabled"

I get the above when trying to register a machine to RHN using the rhn_register Ansible module.

ansible 2.3.1.0
  config file = /home/reinose/ansible_sysops.newvm/ansible.cfg
  configured module search path = [u'library']
  python version = 2.7.5 (default, Aug  2 2016, 04:20:16) [GCC 4.8.5 20150623 (Red Hat 4.8.5-4)]

Red Hat Enterprise Linux Server release 7.2 (Maipo)
yum-rhn-plugin-2.0.1-5.el7.noarch

Seems to register anyway ...

DO

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