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"
    }
}
```
sns_client = aws_stack.connect_to_service('sns')
    topics = sns_client.list_topics()
    for topic in topics['Topics']:
        topic_arn = topic['TopicArn']
        if topic_arn.endswith(':%s' % name):
            return topic_arn
def queue_url_exists(queue_url):
    sqs_client = aws_stack.connect_to_service('sqs')
    queues = sqs_client.list_queues()
    return queue_url in queues['QueueUrls']
def stream_exists(name):
    kinesis_client = aws_stack.connect_to_service('kinesis')
    streams = kinesis_client.list_streams()
    return name in streams['StreamNames']
def get_stack_details(stack_name):
    cloudformation = aws_stack.connect_to_service('cloudformation')
    stacks = cloudformation.describe_stacks(StackName=stack_name)
    for stack in stacks['Stacks']:
        if stack['StackName'] == stack_name:
            return stack
def describe_stack_resource(stack_name, resource_logical_id):