message: Log missing prop in config as warning in console
diff: @@ -303,7 +303,7 @@ export default class Configuration {
  // Dup method: Avoid circular deps with Utils class
  private static isUndefined(name: string, value: any): boolean {
  if (typeof value === 'undefined') {
  - console.error(chalk.red(`Missing property '${name}' in config.json`));
  + console.error(chalk.yellow(`[Warning] Missing property '${name}' in config.json`));
  return true;
  }
  return false;
  