EmberJS model hook: this.store.find returns no data. How do I redirect to a 404 page?

When my path /map/:id finds no value via this.store.find('location', route.id), I'd like to redirect to another page instead of receiving an "adapter's response did not have any data" error. It seems to stop processing before it even gets to the controller.

I thought the best way to do this was to extend DS.FixtureAdapter or to return a proxy object until this.store.find resolves. I read the documentation and it said to extend DS.FixtureAdapter via find or findMany hooks, among others. When I tried, none of the events seemed to fire, and I can't figure out an appropriate alternative return object. What am I doing wrong?