When a subscription is created using cloudformation:
```
"ProfileChangedSubscription": {
      "Type": "AWS::SNS::Subscription",
      "Properties": {
        "Endpoint": {
          "Fn::GetAtt": [
            "ProfileChangedQueue",
            "Arn"
          ]
        },
        "Protocol": "sqs",
        "FilterPolicy": {
          "eventType": [
            "created"
          ]
        },
        "TopicArn": {
          "Fn::ImportValue": {
            "Fn::Sub": "${ProfilesProfilePublishStack}-ProfileChangedTopic"
          }
        }
      }
    }
```

The specified subscription filter policy is not created. When I run `get-subscription-attributes`, I get information about non-existing filter policy:

```
{
    "Attributes": {
        "TopicArn": "arn:aws:sns:us-east-1:000000000000:profile-changed-topic",
        "Endpoint": "arn:aws:sqs:us-east-1:000000000000:profile-changed-queue",
        "Protocol": "sqs",
        "SubscriptionArn": "arn:aws:sns:us-east-1:000000000000:profile-changed-topic:936a58be-525b-4228-bfdb-c4b2f6048e8c",
        "FilterPolicy": "None"
    }
}
```
if isinstance(o, dict):
            for k, v in dict(o).items():
                if v is None:
                    o.pop(k)
        return o
    result = common.recurse_object(params, remove_nones)
    return result
def deploy_resource(resource_id, resources, stack_name):
    return execute_resource_action(resource_id, resources, stack_name, ACTION_CREATE)
def delete_resource(resource_id, resources, stack_name):
    return execute_resource_action(resource_id, resources, stack_name, ACTION_DELETE)
def execute_resource_action(resource_id, resources, stack_name, action_name):
    resource = resources[resource_id]
    resource_type = get_resource_type(resource)
    func_details = RESOURCE_TO_FUNCTION.get(resource_type)
    if not func_details or action_name not in func_details:
        LOG.warning('Action "%s" for resource type %s not yet implemented' % (action_name, resource_type))
        return
    LOG.debug('Running action "%s" for resource type "%s" id "%s"' % (action_name, resource_type, resource_id))
    func_details = func_details[action_name]
    func_details = func_details if isinstance(func_details, list) else [func_details]
    results = []
    for func in func_details:
        if callable(func['function']):
            result = func['function'](resource_id, resources, resource_type, func, stack_name)
            results.append(result)
            continue
        client = get_client(resource, func)
        if client: