### 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_
subscriber_arn = subscriber["SubscriptionArn"]
        filter_policy = subscription_filter_policy.get(subscriber_arn)
        if not filter_policy:
            return True
        
        match subscriber.get("FilterPolicyScope", "MessageAttributes"):
            case "MessageAttributes":
                return self.subscription_filter.check_filter_policy_on_message_attributes(
                    filter_policy=filter_policy, message_attributes=message_ctx.message_attributes
                )
            case "MessageBody":
                return self.subscription_filter.check_filter_policy_on_message_body(
                    filter_policy=filter_policy,
                    message_body=message_ctx.message_content(subscriber["Protocol"]),
                )
    def publish_to_topic(self, ctx: SnsPublishContext, topic_arn: str) -> None:
        subscriptions = ctx.store.get_topic_subscriptions(topic_arn)
        for subscriber in subscriptions:
            if self._should_publish(ctx.store.subscription_filter_policy, ctx.message, subscriber):
                notifier = self.topic_notifiers[subscriber["Protocol"]]
                LOG.debug(
                    "Topic '%s' publishing '%s' to subscribed '%s' with protocol '%s' (subscription '%s')",
                    topic_arn,
                    ctx.message.message_id,
                    subscriber.get("Endpoint"),
                    subscriber["Protocol"],
                    subscriber["SubscriptionArn"],
                )
                self.executor.submit(notifier.publish, context=ctx, subscriber=subscriber)
    def publish_batch_to_topic(self, ctx: SnsBatchPublishContext, topic_arn: str) -> None: