handle empty route object in routeFinishedSetup

[Yubin]

Hi Mike, I hope everything is fine.
Currently we are going to adopt ember-perf. But found a little issue:

Transition data's activateRoute function won't call when my routes have already use active() hook which causing route object is missing in transition-data. So I think Empty route object has better to be checked in routeFinishedSetup of transition-data.

Yubin

[galfert]

Are you calling this._super(...arguments); from your activate() hook? That should be enough so that ember-perf's activate() is called as well.

I found some scenarios though, in which the activate() won't get called nonetheless. I reported those in #83.

[kiwiupover]

Can we add a test for this case? @Yubin