Invalid policiy files due to tailing comma, isn't marked as invalid.

[kisst]

$ tail -n 15 *.json
==> correct.json <==
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "Stmt1729104489507",
      "Action": [
        "q:StartConversation"
      ],
      "Effect": "Allow",
      "Resource": "*"
    }
  ]
}

==> incorrect.json <==
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "Stmt1729104489507",
      "Action": [
        "q:StartConversation",
      ],
      "Effect": "Allow",
      "Resource": "*"
    }
  ]
}
$ parliament --version
parliament 1.6.3
$ parliament --file correct.json && echo "OK" || echo "FAILED"
OK
$ parliament --file incorrect.json && echo "OK" || echo "FAILED"
OK