Description of problem:
It's always necessary to specify tag 

TASK [ovirt-vm-infra : Tag VMs] ************************************************
task path: /usr/share/ansible/roles/oVirt.vm-infra/tasks/main.yml:89
fatal: [localhost]: FAILED! => {
    "msg": "'dict object' has no attribute 'tag'"
}


Version-Release number of selected component (if applicable):
ansible-2.5.0-1.el7ae.noarch
ovirt-ansible-vm-infra-1.1.6-1.el7ev.noarch

How reproducible:
always

Steps to Reproduce:
    vm01:
      cluster: Default
      template: Blank

    vms:
      - name: vm-01
        profile: "{{vm01}}"

Actual results:
failed with: "msg": "'dict object' has no attribute 'tag'"

Expected results:
should not fail