message: Make default onFatalError callback console.error more defensive
diff: @@ -101,7 +101,7 @@ extend(Raven.prototype, {
  }
  this.onFatalError = this.defaultOnFatalError = function (err, sendErr, eventId) {
  - console.error(err.stack);
  + console.error(err && err.stack ? err.stack : err);
  process.exit(1);
  };
  this.uncaughtErrorHandler = this.makeErrorHandler();
  