### 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("cloudformation")
@pytest.fixture(scope="class")
def ssm_client() -> "SSMClient":
    return _client("ssm")
@pytest.fixture(scope="class")
def lambda_client() -> "LambdaClient":
    return _client("lambda")
@pytest.fixture(scope="class")
def kinesis_client() -> "KinesisClient":
    return _client("kinesis")
@pytest.fixture(scope="class")
def kms_client() -> "KMSClient":
    return _client("kms")
@pytest.fixture(scope="class")
def logs_client() -> "CloudWatchLogsClient":
    return _client("logs")
@pytest.fixture(scope="class")
def events_client() -> "EventBridgeClient":
    return _client("events")
@pytest.fixture(scope="class")
def secretsmanager_client() -> "SecretsManagerClient":
    return _client("secretsmanager")
@pytest.fixture(scope="class")
def stepfunctions_client() -> "SFNClient":
    return _client("stepfunctions")
@pytest.fixture(scope="class")
def ses_client() -> "SESClient":
    return _client("ses")
@pytest.fixture(scope="class")
def es_client() -> "ElasticsearchServiceClient":