### 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_
@markers.aws.only_localstack
    def test_topic_email_subscription_confirmation(
        self, sns_create_topic, sns_subscription, aws_client
    ):
        # F
        # c
        # f
        topic_arn = sns_create_topic()["TopicArn"]
        subscription = sns_subscription(
            TopicArn=topic_arn,
            Protocol="email",
            Endpoint="localstack@yopmail.com",
        )
        subscription_arn = subscription["SubscriptionArn"]
        parsed_arn = parse_arn(subscription_arn)
        store = SnsProvider.get_store(parsed_arn["account"], parsed_arn["region"])
        sub_attr = aws_client.sns.get_subscription_attributes(SubscriptionArn=subscription_arn)
        assert sub_attr["Attributes"]["PendingConfirmation"] == "true"
        def check_subscription():
            for token, sub_arn in store.subscription_tokens.items():
                if sub_arn == subscription_arn:
                    aws_client.sns.confirm_subscription(TopicArn=topic_arn, Token=token)
            sub_attributes = aws_client.sns.get_subscription_attributes(
                SubscriptionArn=subscription_arn
            )
            assert sub_attributes["Attributes"]["PendingConfirmation"] == "false"
        retry(check_subscription, retries=PUBLICATION_RETRIES, sleep=PUBLICATION_TIMEOUT)
class TestSNSFilter:
    @markers.aws.validated
    def test_filter_policy(