### 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_
with pytest.raises(ClientError) as e:
            message = json.dumps({"default": {"object": "test"}})
            aws_client.sns.publish(
                TopicArn=topic_arn,
                Message=message,
                MessageStructure="json",
            )
        snapshot.match("key-is-not-string", e.value.response)
class TestSNSSubscriptionCrud:
    @markers.aws.validated
    def test_subscribe_with_invalid_protocol(self, sns_create_topic, sns_subscription, snapshot):
        topic_arn = sns_create_topic()["TopicArn"]
        with pytest.raises(ClientError) as e:
            sns_subscription(
                TopicArn=topic_arn, Protocol="test-protocol", Endpoint="localstack@yopmail.com"
            )
        snapshot.match("exception", e.value.response)
    @markers.aws.validated
    def test_unsubscribe_from_non_existing_subscription(
        self, sns_create_topic, sqs_create_queue, sns_create_sqs_subscription, snapshot, aws_client
    ):
        topic_arn = sns_create_topic()["TopicArn"]
        queue_url = sqs_create_queue()
        subscription = sns_create_sqs_subscription(topic_arn=topic_arn, queue_url=queue_url)
        aws_client.sns.unsubscribe(SubscriptionArn=subscription["SubscriptionArn"])
        
        response = aws_client.sns.unsubscribe(SubscriptionArn=subscription["SubscriptionArn"])
        snapshot.match("empty-unsubscribe", response)
    @markers.aws.validated
    def test_create_subscriptions_with_attributes(