Error Handling: Incorrect ID leads to undefined exception

In the demo, the URL for a particular location is as follows:

http://www.bennolan.com/science/backbone-mobile/#{id}

where {id} is the location identifier. If you manually type an incorrect {id} in the URL, an exception is thrown (this.model is undefined), instead of failing gracefully.

Reproduce the issue in the demo by opening the location URL with an invalid id, then trace where the undefined this.model exception is raised. Done means an incorrect location id fails gracefully instead of throwing an exception.

Written by the indexing model from the issue text.