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"
    }
}
```
stack = get_stack_details(stack_name)
            self.assertEqual(stack['StackStatus'], 'CREATE_COMPLETE')
        retry(check_stack, retries=3, sleep=2)
        
        assert bucket_exists('cf-test-bucket-1')
        assert queue_exists('cf-test-queue-1')
        topic_arn = topic_exists('%s-test-topic-1-1' % stack_name)
        assert topic_arn
        assert stream_exists('cf-test-stream-1')
        resource = describe_stack_resource(stack_name, 'SQSQueueNoNameProperty')
        assert queue_exists(resource['PhysicalResourceId'])
        
        tags = s3.get_bucket_tagging(Bucket='cf-test-bucket-1')['TagSet']
        self.assertEqual(tags, [{'Key': 'foobar', 'Value': aws_stack.get_sqs_queue_url('cf-test-queue-1')}])
        tags = sns.list_tags_for_resource(ResourceArn=topic_arn)['Tags']
        self.assertEqual(tags, [
            {'Key': 'foo', 'Value': 'cf-test-bucket-1'},
            {'Key': 'bar', 'Value': aws_stack.s3_bucket_arn('cf-test-bucket-1')}