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"
    }
}
```
cloudformation = aws_stack.connect_to_service('cloudformation')
    response = cloudformation.describe_stack_resources(StackName=stack_name)
    for resource in response['StackResources']:
        if resource['LogicalResourceId'] == resource_logical_id:
            return resource
def list_stack_resources(stack_name):
    cloudformation = aws_stack.connect_to_service('cloudformation')
    response = cloudformation.list_stack_resources(StackName=stack_name)
    return response['StackResourceSummaries']
def get_queue_urls():
    sqs = aws_stack.connect_to_service('sqs')
    response = sqs.list_queues()
    return response['QueueUrls']
def get_topic_arns():
    sqs = aws_stack.connect_to_service('sns')
    response = sqs.list_topics()
    return [t['TopicArn'] for t in response['Topics']]
class CloudFormationTest(unittest.TestCase):
    def test_create_delete_stack(self):
        cloudformation = aws_stack.connect_to_resource('cloudformation')
        cf_client = aws_stack.connect_to_service('cloudformation')
        s3 = aws_stack.connect_to_service('s3')
        sns = aws_stack.connect_to_service('sns')
        apigateway = aws_stack.connect_to_service('apigateway')
        template = template_deployer.template_to_json(load_file(TEST_TEMPLATE_1))
        
        stack_name = 'stack-%s' % short_uid()
        cloudformation.create_stack(StackName=stack_name, TemplateBody=template)
        
        def check_stack():