message: Fixes - check for webserver before attempting to add a route
diff: @@ -148,6 +148,7 @@ export class FacebookAdapter extends BotAdapter {
  */
  public async init(botkit): Promise<any> {
  debug('Add GET webhook endpoint for verification at: ', botkit.getConfig('webhook_uri'));
  + if (botkit.webserver) {
  botkit.webserver.get(botkit.getConfig('webhook_uri'), (req, res) => {
  if (req.query['hub.mode'] === 'subscribe') {
  if (req.query['hub.verify_token'] === this.options.verify_token) {
  @@ -158,6 +159,7 @@ export class FacebookAdapter extends BotAdapter {
  }
  });
  }
  + }
  /**
  * Get a Facebook API client with the correct credentials based on the page identified in the incoming activity.
  