### 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, ctx: SnsPublishContext, topic_arn: str, subscription_arn: str
    ) -> None:
        """
        This allows us to publish specific HTTP(S) messages specific to those endpoints, namely
        `SubscriptionConfirmation` and `UnsubscribeConfirmation`. Those are "topic" messages in shape, but are sent
        only to the endpoint subscribing or unsubscribing.
        This is only used internally.
        Note: might be needed for multi account SQS and Lambda `SubscriptionConfirmation`
        :param ctx: SnsPublishContext
        :param topic_arn: the topic of the subscriber
        :param subscription_arn: the ARN of the subscriber
        :return: None
        """
        subscriber = ctx.store.subscriptions.get(subscription_arn)
        if not subscriber:
            return
        notifier = self.topic_notifiers[subscriber["Protocol"]]
        LOG.debug(
            "Topic '%s' publishing '%s' to subscribed '%s' with protocol '%s' (Id='%s', Subscription='%s')",
            topic_arn,
            ctx.message.type,
            subscription_arn,
            subscriber["Protocol"],
            ctx.message.message_id,
            subscriber.get("Endpoint"),
        )
        self.executor.submit(notifier.publish, context=ctx, subscriber=subscriber)