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.
def test_lambda_invoked_by_sqs_message_with_attributes(self):
        function_name = 'lambda_func-{}'.format(short_uid())
        queue_name = 'queue-{}'.format(short_uid())
        queue_url = self.client.create_queue(QueueName=queue_name)['QueueUrl']
        testutil.create_lambda_function(
            handler_file=TEST_LAMBDA_ECHO_FILE,
            func_name=function_name,
            runtime=LAMBDA_RUNTIME_PYTHON36
        )
        lambda_client = aws_stack.connect_to_service('lambda')
        lambda_client.create_event_source_mapping(
            EventSourceArn=aws_stack.sqs_queue_arn(queue_name),
            FunctionName=function_name
        )
        self.client.send_message(
            QueueUrl=queue_url,
            MessageBody='hello world.',
            MessageAttributes=TEST_MESSAGE_ATTRIBUTES
        )
        events = get_lambda_log_events(function_name)
        self.assertEqual(len(events), 1)
        sqs_msg = events[0]['Records'][0]
        self.assertEqual(sqs_msg['body'], 'hello world.')
        self.assertIn('messageAttributes', sqs_msg)
        self.assertIn('City', sqs_msg['messageAttributes'])
        self.assertEqual(sqs_msg['messageAttributes']['City'], TEST_MESSAGE_ATTRIBUTES['City'])
        
        self.client.delete_queue(QueueUrl=queue_url)
        lambda_client.delete_function(FunctionName=function_name)
    def test_send_message_with_delay_seconds(self):