message: fix checking history state for ssr
diff: @@ -17,7 +17,8 @@ export class ActivityFeedService {
  static bootstrap(items?: ActivityFeedInput[], options?: ActivityFeedContainerOptions) {
  // vue-router maintains a history key for each route in the history.
  - const key: string | undefined = history.state && history.state.key;
  + const key: string | undefined =
  + typeof history !== 'undefined' ? history.state && history.state.key : undefined;
  // If we have a state container for this historical key...
  let state = this._states.find(item => item.key === key);
  