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"
    }
}
```
s3_client = aws_stack.connect_to_service('s3')
    buckets = s3_client.list_buckets()
    for bucket in buckets['Buckets']:
        if bucket['Name'] == name:
            return True
def queue_exists(name):
    sqs_client = aws_stack.connect_to_service('sqs')
    queues = sqs_client.list_queues()
    try:
        url = name if '://' in name else aws_stack.get_sqs_queue_url(name)
    except Exception:
        return False
    for queue_url in queues['QueueUrls']:
        if queue_url == url:
            return True
def topic_exists(name):