### 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_
"""
    The SMS publisher is responsible for publishing the SNS message directly to a phone number.
    This is not directly implemented yet in LocalStack, we only save the message.
    """
    def _publish(self, context: SnsPublishContext, endpoint: str):
        event = self.prepare_message(context.message, endpoint)
        context.store.sms_messages.append(event)
        LOG.info(
            "Delivering SMS message to %s: %s",
            event["PhoneNumber"],
            event["Message"],
        )
        
        
    def prepare_message(self, message_context: SnsMessage, endpoint: str) -> dict:
        return {
            "PhoneNumber": endpoint,
            "TopicArn": None,
            "SubscriptionArn": None,
            "MessageId": message_context.message_id,
            "Message": message_context.message_content(protocol="sms"),
            "MessageAttributes": message_context.message_attributes,
            "MessageStructure": message_context.message_structure,
            "Subject": message_context.subject,
        }
class ApplicationEndpointPublisher(EndpointPublisher):