### 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_
)
        assert poll_condition(
            lambda: len(server.log) >= 1,
            timeout=5,
        )
        sub_request, _ = server.log[0]
        payload = sub_request.get_json(force=True)
        assert payload["Type"] == "SubscriptionConfirmation"
        assert sub_request.headers["x-amz-sns-message-type"] == "SubscriptionConfirmation"
        subscribe_url = payload["URL"]
        service_url, subscribe_url_path = payload["URL"].rsplit("/", maxsplit=1)
        confirm_subscribe_request = requests.get(subscribe_url)
        confirm_subscribe = xmltodict.parse(confirm_subscribe_request.content)
        assert (
            confirm_subscribe["ConfirmSubscriptionResponse"]["ConfirmSubscriptionResult"][
                "SubscriptionArn"
            ]
            == http_subscription_arn
        )
        subscription_attributes = aws_client.sns.get_subscription_attributes(
            SubscriptionArn=http_subscription_arn
        )
        assert subscription_attributes["Attributes"]["PendingConfirmation"] == "false"
        server.stop()
        wait_for_port_closed(server.port)
        message = "test_dlq_external_http_endpoint"
        aws_client.sns.publish(TopicArn=topic_arn, Message=message)
        response = aws_client.sqs.receive_message(QueueUrl=dlq_url, WaitTimeSeconds=3)
        assert (
            len(response["Messages"]) == 1