### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

It seems that it is possible to receive sns message in an sqs listener if there is a filterpolicy in place for null value in a message attribute, and a message is being sent without the message attribute.

### Expected Behavior

Don't recieve these type of messages

### How are you starting LocalStack?

With a docker-compose file

### Steps To Reproduce

`sns subscribe --topic-arn "demoTopicArn"  --protocol sqs --notification-endpoint "demoSqsEndpoint" --attributes '{"RawMessageDelivery": "true"}'`
`sns set-subscription-attributes --subscription-arn demoSubsArn --attribute-name FilterPolicy --attribute-value '{"testForNull": [null,{"anything-but": ["notgood"]}]}'`
`sns publish --topic-arn demoTopicArn --message "testforrecieval"`
`sqs receive-message --queue-url  "demoUrl"`

### Environment

```markdown
- OS: macOS 13.6
- LocalStack: 2.2.0
```


### Anything else?

_No response_
self, sns_create_topic, sns_subscription, aws_client
    ):
        # c
        topic_arn = sns_create_topic()["TopicArn"]
        # b
        _requests = queue.Queue()
        # c
        def handler(_request):
            _requests.put(_request)
            return Response(status=429)
        number_of_endpoints = 4
        servers = []
        try:
            for _ in range(number_of_endpoints):
                server = HTTPServer()
                server.start()
                servers.append(server)
                server.expect_request("/").respond_with_handler(handler)
                http_endpoint = server.url_for("/")
                wait_for_port_open(http_endpoint)
                sns_subscription(TopicArn=topic_arn, Protocol="http", Endpoint=http_endpoint)
            # f
            subscription_list = aws_client.sns.list_subscriptions_by_topic(TopicArn=topic_arn)
            assert subscription_list["ResponseMetadata"]["HTTPStatusCode"] == 200
            assert (
                len(subscription_list["Subscriptions"]) == number_of_endpoints