R1:aa9395e38fc9

Fix bad variable causing `aphlict` to fail to start with no "logs" config

Summary: Fixes T10863. See that task for discussion.

Test Plan:
- Configured `aphlict` with no "logs".
- Started `aphlict`.
- Before change: exception.
- After change: worked.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10863

Differential Revision: https://secure.phabricator.com/D15788