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"
    }
}
```
client = aws_stack.connect_to_service('cloudformation')
    try:
        result = client.describe_stack_resource(StackName=stack_name, LogicalResourceId=logical_resource_id)
        return result['StackResourceDetail']
    except Exception as e:
        LOG.warning('Unable to get details for resource "%s" in CloudFormation stack "%s": %s' %
                    (logical_resource_id, stack_name, e))
def retrieve_resource_details(resource_id, resource_status, resources, stack_name):
    resource = resources.get(resource_id)
    resource_id = resource_status.get('PhysicalResourceId') or resource_id
    if not resource:
        resource = {}
    resource_type = get_resource_type(resource)
    resource_props = resource.get('Properties')
    try:
        if resource_type == 'Lambda::Function':
            resource_id = resource_props['FunctionName'] if resource else resource_id
            return aws_stack.connect_to_service('lambda').get_function(FunctionName=resource_id)
        elif resource_type == 'Lambda::Version':
            name = resource_props.get('FunctionName')
            if not name:
                return None
            func_name = aws_stack.lambda_function_name(name)