rhsm_password fail when using activation key

[rlopez133]

When using an activation key, no rhsm password is required. However, playbook reports the following error:

TASK [subscription-manager : Initialize rhsm_password variable if vars_prompt was used] **************************************************
fatal: [dns-0.openshift.example.com]: FAILED! => {"failed": true, "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'dict object' has no attribute 'rhsm_password'\n\nThe error appears to have been in '/home/cloud-user/openshift-ansible-contrib/roles/subscription-manager/tasks/main.yml': line 2, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n---\n- name: "Initialize rhsm_password variable if vars_prompt was used"\n ^ here\n"}

@tomassedovic - This is regarding the provisioning stage within https://github.com/openshift/openshift-ansible-contrib/tree/master/playbooks/provisioning/openstack

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