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 not api_id or not parent_id:
                return None
            api_resources = aws_stack.connect_to_service('apigateway').get_resources(restApiId=api_id)['items']
            target_resource = list(filter(lambda res:
                res.get('parentId') == parent_id and res['pathPart'] == resource_props['PathPart'], api_resources))
            if not target_resource:
                return None
            path = aws_stack.get_apigateway_path_for_resource(api_id,
                target_resource[0]['id'], resources=api_resources)
            result = list(filter(lambda res: res['path'] == path, api_resources))
            return result[0] if result else None
        elif resource_type == 'ApiGateway::Deployment':
            api_id = resource_props['RestApiId'] if resource else resource_id
            api_id = resolve_refs_recursively(stack_name, api_id, resources)
            if not api_id:
                return None
            result = aws_stack.connect_to_service('apigateway').get_deployments(restApiId=api_id)['items']
            
            return result[0] if result else None
        elif resource_type == 'ApiGateway::Method':
            api_id = resolve_refs_recursively(stack_name, resource_props['RestApiId'], resources)
            res_id = resolve_refs_recursively(stack_name, resource_props['ResourceId'], resources)
            if not api_id or not res_id:
                return None
            res_obj = aws_stack.connect_to_service('apigateway').get_resource(restApiId=api_id, resourceId=res_id)
            match = [v for (k, v) in res_obj['resourceMethods'].items()
                     if resource_props['HttpMethod'] in (v.get('httpMethod'), k)]
            int_props = resource_props.get('Integration')
            if int_props:
                match = [m for m in match if