R1:f0682941b64e

Testing that PhabricatorEnv::getEnvConfig throws an exception if config option is not found.

Summary: Unit test for T2345

Test Plan: Ran unit tests, checked that it passed.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4552