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`.
return resolve_ref(stack_name, resource_id, resources,
                                attribute='PhysicalResourceId')
                        except Exception as e:
                            LOG.debug('Unable to extract physical id for resource %s: %s' % (resource_id, e))
                else:
                    if callable(prop_key):
                        prop_value = prop_key(resource_props, stack_name=stack_name, resources=resources)
                    else:
                        prop_value = resource_props.get(prop_key)
                    if prop_value is not None:
                        params[param_key] = prop_value
    
    for param_key, prop_keys in dict(params).items():
        tmp_value = params.get(param_key)
        if tmp_value is not None:
            params[param_key] = resolve_refs_recursively(stack_name, tmp_value, resources)
        
        if str(tmp_value).lower() in ['true', 'false']:
            params[param_key] = str(tmp_value).lower() == 'true'
    
    params = json.loads(aws_stack.fix_account_id_in_arns(json.dumps(params)))
    
    params = common.merge_recursive(defaults, params)
    
    params = convert_data_types(func_details, params)
    
    try:
        LOG.debug('Request for creating resource type "%s": %s %s' % (
            resource_type, func_details['function'], params))
        result = function(**params)