With today's update this `serverless.yml` no longer deploys:

```yaml
service: "localtest"

provider:
  name: "aws"
  runtime: "nodejs10.x"

functions:
  hello:
    handler: "handler.hello"
    events:
    - http:
        path: "/"
        method: "get"
        integration: "lambda-proxy"

plugins:
  - "serverless-localstack"

custom:
  localstack:
    stages:
      - "local"
```

The error on the localstack end seems to be that it cannot create `ApiGateway::RestApi` type resources:
```
2019-10-24T09:10:41:DEBUG:localstack.utils.cloudformation.template_deployer: Deploying resource type "ApiGateway::RestApi" id "ApiGatewayRestApi"
2019-10-24T09:10:41:DEBUG:localstack.utils.cloudformation.template_deployer: Request for creating resource type "ApiGateway::RestApi": create_rest_api {'name': 'local-localtest'}
2019-10-24T09:10:41:ERROR:localstack.services.cloudformation.cloudformation_starter: Unable to parse and create resource "ApiGatewayRestApi": argument of type 'NoneType' is not iterable
```

This is followed by repeated `TypeError` and then `KeyError`.
zip_file=zip_file,
            runtime=LAMBDA_RUNTIME_PYTHON27,
            envvars={'Hello': 'World'}
        )
        self.assertEqual(len(executor.get_all_container_names()), 0)
        self.assertDictEqual(executor.function_invoke_times, {})
        
        durations = []
        num_iterations = 3
        for i in range(0, num_iterations + 1):
            prev_invoke_time = None
            if i > 0:
                prev_invoke_time = executor.function_invoke_times[func_arn]
            start_time = time.time()
            self.lambda_client.invoke(FunctionName=func_name, Payload=b'{}')
            duration = time.time() - start_time
            self.assertEqual(len(executor.get_all_container_names()), 1)
            
            if i > 0:
                self.assertGreater(executor.function_invoke_times[func_arn], prev_invoke_time)
            else:
                self.assertGreater(executor.function_invoke_times[func_arn], 0)
            durations.append(duration)
        
        for i in range(1, num_iterations + 1):
            self.assertLess(durations[i], durations[0])
        status = executor.get_docker_container_status(func_arn)
        self.assertEqual(status, 1)
        container_network = executor.get_docker_container_network(func_arn)
        self.assertEqual(container_network, 'default')