Real SQS throws `There should be at least one SendMessageBatchRequestEntry in the request. (Service: AmazonSQS; Status Code: 400; Error Code: AWS.SimpleQueueService.EmptyBatchRequest;` when there is a send batch of zero size.

This would be useful to mimic inside localstack in order to find these bugs earlier.
queue_name = 'queue-{}'.format(short_uid())
        queue_url = self.client.create_queue(QueueName=queue_name)['QueueUrl']
        
        self.client.send_message(
            QueueUrl=queue_url,
            MessageBody='hello world.',
            DelaySeconds=0
        )
        rs = self.client.receive_message(QueueUrl=queue_url)
        self.assertIn('Messages', rs)
        self.assertEqual(len(rs['Messages']), 1)
        message = rs['Messages'][0]
        self.assertEqual(message['Body'], 'hello world.')
        self.client.delete_message_batch(
            QueueUrl=queue_url,
            Entries=[{'Id': short_uid(), 'ReceiptHandle': message['ReceiptHandle']}]
        )
        
        self.client.send_message(
            QueueUrl=queue_url,
            MessageBody='test_message_2',
            DelaySeconds=10
        )
        rs = self.client.receive_message(QueueUrl=queue_url)
        self.assertEqual(rs['ResponseMetadata']['HTTPStatusCode'], 200)
        self.assertNotIn('Messages', rs)
        def get_message(q_url):