We were checking tho project_id but not the project_key. However, in our
example secrets file we actually include a project_id but not a
project_key, and so new CONSUL installations would crash in production
environments.
Although technically the application doesn't crash if no host is
defined, we're also ignoring the current environment if no host is
defined, since errbit/airbrake is unlikely to work in this scenario.
a1bb9bd5d6