A reproduction of iron-router issue 616, where a template gets rendered before its waitOn hook returns.
Git clone the repo, run mrt install, and then run Meteor. If you're running locally, go to
http://localhost:3000/widget
To see an online version, go to: http://iron-router-waiton-bug.meteor.com/widget
Check the console logs to see that the template gets rendered before the waitOn hook is ready. You might also be able to see the text on the screen flicker.