Auditing an assume role policy document (trust relationship) fails without a Resource specified

[josegonzalez]

I have the following policy document:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::1234567890:root"
            },
            "Action": "sts:AssumeRole"
        }
    ]
}

Running parliament with no options against this policy fails with the following error:

MEDIUM - Unknown AWS principal -  - arn:aws:iam::1234567890:root - {'line': 7, 'column': 26, 'filepath': 'assume_role_policy.json'}
HIGH - Malformed - Policy does not contain a required element - Statement contains neither Resource nor NotResource - {'line': 4, 'column': 9, 'filepath': 'assume_role_policy.json'}

I'm not sure how to fix it as the policy is definitely valid. Is this a bug in parliament or am I passing in the wrong type for parliament?