### 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_
return _client("es")
@pytest.fixture(scope="class")
def firehose_client() -> "FirehoseClient":
    return _client("firehose")
@pytest.fixture(scope="class")
def cloudwatch_client() -> "CloudWatchClient":
    return _client("cloudwatch")
@pytest.fixture
def dynamodb_create_table(dynamodb_client):
    tables = list()
    def factory(**kwargs):
        kwargs["client"] = dynamodb_client
        if "table_name" not in kwargs:
            kwargs["table_name"] = "test-table-%s" % short_uid()
        if "partition_key" not in kwargs:
            kwargs["partition_key"] = "id"
        kwargs["sleep_after"] = 0
        tables.append(kwargs["table_name"])
        return create_dynamodb_table(**kwargs)
    yield factory
    
    for table in tables:
        try:
            dynamodb_client.delete_table(TableName=table)
        except Exception as e:
            LOG.debug("error cleaning up table %s: %s", table, e)
@pytest.fixture
def s3_create_bucket(s3_client):