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"
    }
}
```
'ProvisionedThroughput': 'ProvisionedThroughput',
                'LocalSecondaryIndexes': 'LocalSecondaryIndexes',
                'GlobalSecondaryIndexes': 'GlobalSecondaryIndexes',
                'StreamSpecification': lambda params, **kwargs: (
                    common.merge_dicts(params.get('StreamSpecification'), {'StreamEnabled': True}, default=None))
            },
            'defaults': {
                'ProvisionedThroughput': {
                    'ReadCapacityUnits': 5,
                    'WriteCapacityUnits': 5
                }
            }
        }
    },
    'Events::Rule': {
        'create': [{
            'function': 'put_rule',
            'parameters': {
                'Name': PLACEHOLDER_RESOURCE_NAME,
                'ScheduleExpression': 'ScheduleExpression',
                'EventPattern': 'EventPattern',
                'State': 'State',
                'Description': 'Description'
            }
        }, {
            'function': 'put_targets',
            'parameters': {
                'Rule': PLACEHOLDER_RESOURCE_NAME,
                'EventBusName': 'EventBusName',
                'Targets': 'Targets'