### 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_
req_data["Message"][0],
        )
        
        delivery = {
            "phoneCarrier": "Mock Carrier",
            "mnc": 270,
            "priceInUSD": 0.00645,
            "smsType": "Transactional",
            "mcc": 310,
            "providerResponse": "Message has been accepted by phone carrier",
            "dwellTimeMsUntilDeviceAck": 200,
        }
        store_delivery_log(subscriber, True, message, message_id, delivery)
        return
    elif subscriber["Protocol"] == "sqs":
        queue_url = None
        try:
            endpoint = subscriber["Endpoint"]
            if "sqs_queue_url" in subscriber:
                queue_url = subscriber.get("sqs_queue_url")
            elif "://" in endpoint:
                queue_url = endpoint
            else:
                queue_name = endpoint.split(":")[5]
                queue_url = aws_stack.get_sqs_queue_url(queue_name)
                subscriber["sqs_queue_url"] = queue_url
            message_group_id = (
                req_data.get("MessageGroupId")[0] if req_data.get("MessageGroupId") else ""
            )
            sqs_client = aws_stack.connect_to_service("sqs")