Make Airbrake conditional.
Make Airbrake conditional.

Why:

We only want to configure Airbrake if both required keys are present. We
want to be okay not having those keys available, since prepending
every command with `foreman run` gets annoying.

This change addresses the need by:

* Wrapping Airbrake config in a conditional.

MAPC/developmentdatabase,MAPC/developmentdatabase,MAPC/developmentdatabase,MAPC/developmentdatabase