EmberJS Tutorial mod - Why, when adding Complex Component, my page content disappeared?

I'm currently working through the EmberJS tutorial and adapting it to a project I have as I go. The tutorial is to build a house rental site. I'm adapting it to build a bus route listing site as a basis for a project I'm working on.

The site was progressing in line with the tutorial steps until I added a complex component (described here). The changes I made are described in this commit on GitHub.

Instead of producing a form to search the project site's data for listings (in my case, routes) that match the basic search parameters, my project site has lost the main page content.

I can't work out how I broke this and why the search form isn't being rendered on the page? I followed the steps and mostly substituted references to rental with route to try and minimize the overall changes to the tutorial code.

I'm using the tutorial to gain a better understanding of EmberJS so I more completely redevelop my Modiin Bus site using this framework.