Description of problem:
When editing /api/policies/:id the action fails with
{
  "error": {
    "kind": "bad_request",
    "message": "Resource conditions_ids, policy_contents needs be specified for creating a new policies",
    "klass": "Api::BadRequestError"
  }
}

The request succeeds when complete data is supplied. However, it's not expected behavior to insist on supplying all the data used for creating the resource just for changing e.g. the description.


Version-Release number of selected component (if applicable):


How reproducible:
Very


Steps to Reproduce:
1. create new policy, e.g. with
POST /api/policies
{
  "action": "create",
  "resources": [{
    "name": "test policy foo",
    "description": "Desc foo",
    "mode": "control",
    "towhat": "ContainerImage",
    "conditions_ids": [ 18, 19 ],
    "policy_contents": [{
      "event_id": 2,
      "actions": [ {"action_id": 1, "opts": { "qualifier": "failure" } } ]
    }]
  }]
}
2. edit the resource
POST /api/policies/:id
{
  "action": "edit",
  "description": "New Desc Bar"
}