Currently, when using this test, it fails with the following error
message:
> AttributeError: 'NoneType' object has no attribute 'rfind'
This is because there is no _raw_params value for parent_include.args
here
https://github.com/ansible/ansible/blob/devel/lib/ansible/playbook/included_file.py#L104
This commit ensure the value is specified so it can be reused and hence
not fail at this specific line.