### 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_
sns_backend = SNSBackend.get()
    sns_backend.sns_tags[topic_arn] = [t for t in _get_tags(topic_arn) if t["Key"] not in tag_keys]
def get_subscription_by_arn(sub_arn):
    sns_backend = SNSBackend.get()
    
    for key, subscriptions in sns_backend.sns_subscriptions.items():
        for sub in subscriptions:
            if sub["SubscriptionArn"] == sub_arn:
                return sub
def make_response(op_name, content="", message_id=None):
    response = Response()
    if not content:
        message_id = message_id or str(uuid.uuid4())
        content = "<MessageId>%s</MessageId>" % message_id
    response._content = """<{op_name}Response xmlns="http://sns.amazonaws.com/doc/2010-03-31/">
        <{op_name}Result>
            {content}
        </{op_name}Result>
        <ResponseMetadata><RequestId>{req_id}</RequestId></ResponseMetadata>
        </{op_name}Response>""".format(
        op_name=op_name, content=content, req_id=short_uid()
    )
    response.status_code = 200
    return response
def make_error(message, code=400, code_string="InvalidParameter"):