### 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_
# L
        events = retry(
            check_expected_lambda_log_events_length,
            retries=3,
            sleep=1,
            function_name=func_name,
            expected_length=1,
        )
        message = events[0]["Records"][0]
        self.assertEqual(message["EventSubscriptionArn"], subscription_arn)
        self.sns_client.publish(
            TargetArn=topic_arn, Message="test_message_2", Subject="test subject"
        )
        events = retry(
            check_expected_lambda_log_events_length,
            retries=3,
            sleep=1,
            function_name=func_name,
            expected_length=2,
        )
        # L
        self.assertEqual(len(events), 2)
        for event in events:
            message = event["Records"][0]
            self.assertEqual(message["EventSubscriptionArn"], subscription_arn)
        # c
        self.sns_client.delete_topic(TopicArn=topic_arn)
        lambda_client = aws_stack.connect_to_service("lambda")
        lambda_client.delete_function(FunctionName=func_name)
    def test_publish_message_after_subscribe_topic(self):