### 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_
# c
        queue_arn = aws_stack.sqs_queue_arn(TEST_QUEUE_NAME)
        self.sns_client.subscribe(
            TopicArn=self.topic_arn,
            Protocol="sqs",
            Endpoint=queue_arn,
            Attributes={"RawMessageDelivery": "true"},
        )
        # f
        subscription_list = self.sns_client.list_subscriptions()
        subscription_arn = ""
        for subscription in subscription_list["Subscriptions"]:
            if subscription["TopicArn"] == self.topic_arn:
                subscription_arn = subscription["SubscriptionArn"]
        actual_attributes = self.sns_client.get_subscription_attributes(
            SubscriptionArn=subscription_arn
        )["Attributes"]
        # a
        self.assertTrue(actual_attributes["RawMessageDelivery"])
        # p
        message = "This is a test message"
        binary_attribute = b"\x02\x03\x04"
        # e
        # h
        self.sns_client.publish(
            TopicArn=self.topic_arn,
            Message=message,
            MessageAttributes={"store": {"DataType": "Binary", "BinaryValue": binary_attribute}},
        )
        def check_message():