### 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_
files = aws_client.s3.list_objects(Bucket=bucket_name)["Contents"]
            f = BytesIO()
            aws_client.s3.download_fileobj(bucket_name, files[0]["Key"], f)
            content = to_str(f.getvalue())
            sns_message = json.loads(content.split("\n")[0])
            assert "Type" in sns_message
            assert "MessageId" in sns_message
            assert "Message" in sns_message
            assert "Timestamp" in sns_message
            assert message == sns_message["Message"]
        retries = 5
        sleep = 1
        sleep_before = 0
        if is_aws_cloud():
            retries = 30
            sleep = 10
            sleep_before = 10
        retry(validate_content, retries=retries, sleep_before=sleep_before, sleep=sleep)
class TestSNSMultiAccounts:
    @pytest.fixture
    def sns_primary_client(self, aws_client):
        return aws_client.sns
    @pytest.fixture
    def sns_secondary_client(self, secondary_aws_client):