### 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_
r"(?i)(?<=URL[\"|']:\s[\"|'])(https?.*?)(?=/\?Action=ConfirmSubscription)",
                    replacement="<subscribe-domain>",
                ),
            ]
        )
        # N
        topic_arn, subscription_arn, endpoint_url, server = sns_create_http_endpoint(
            raw_message_delivery
        )
        assert poll_condition(
            lambda: len(server.log) >= 1,
            timeout=5,
        )
        sub_request, _ = server.log[0]
        payload = sub_request.get_json(force=True)
        snapshot.match("subscription-confirmation", payload)
        assert payload["Type"] == "SubscriptionConfirmation"
        assert sub_request.headers["x-amz-sns-message-type"] == "SubscriptionConfirmation"
        assert "Signature" in payload
        assert "SigningCertURL" in payload
        token = payload["Token"]
        subscribe_url = payload["URL"]
        service_url, subscribe_url_path = payload["URL"].rsplit("/", maxsplit=1)
        assert subscribe_url == (
            f"{service_url}/?Action=ConfirmSubscription&TopicArn={topic_arn}&Token={token}"
        )
        test_broken_confirm_url = (
            f"{service_url}/?Action=ConfirmSubscription&TopicArn=not-an-arn&Token={token}"
        )
        broken_confirm_subscribe_request = requests.get(test_broken_confirm_url)