### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

When you publish a message to SNS without a *body* (e.g. only attributes) it succeeds.

### Expected Behavior

Trying to publish a message without a *body* should fail (at least it does when trying to do this in AWS)

### How are you starting LocalStack?

Custom (please describe below)

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

using Java testcontainers...

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

```bash
#!/bin/sh
 
queue_arn=$(awslocal sqs create-queue --queue-name $QUEUE_NAME --output text)
echo "Queue ARN: $queue_arn"

topic_arn=$(awslocal sns create-topic --name $TOPIC_NAME --output text)
echo "Topic ARN: $topic_arn"

subscription_arn=$(awslocal sns subscribe \
    --attributes RawMessageDelivery=true \
    --topic-arn "$topic_arn" \
    --protocol sqs \
    --notification-endpoint "$queue_arn" \
    --output text)
echo "Subscription ARN: $subscription_arn" 
```


### Environment

```markdown
- OS: OSX 11.5.2
- LocalStack: 0.13.0
- Docker Desktop: v20.10.8
```


### Anything else?

_No response_
queue_urls = list()
    def factory(**kwargs):
        if "QueueName" not in kwargs:
            kwargs["QueueName"] = "test-queue-%s" % short_uid()
        response = sqs_client.create_queue(**kwargs)
        url = response["QueueUrl"]
        queue_urls.append(url)
        return url
    yield factory
    
    for queue_url in queue_urls:
        try:
            sqs_client.delete_queue(QueueUrl=queue_url)
        except Exception as e:
            LOG.debug("error cleaning up queue %s: %s", queue_url, e)
@pytest.fixture
def sqs_queue(sqs_create_queue):
    return sqs_create_queue()
@pytest.fixture
def sns_topic(sns_client):
    
    topic_name = "test-topic-%s" % short_uid()
    response = sns_client.create_topic(Name=topic_name)
    topic_arn = response["TopicArn"]
    yield sns_client.get_topic_attributes(TopicArn=topic_arn)
    sns_client.delete_topic(TopicArn=topic_arn)
@pytest.fixture
def kms_key(kms_client):