Summary: Fixes T5695. A Conduit "method does not exist" exception is somewhat expected... there is no need to `phlog` the exception.
Test Plan: Called a non-existent Conduit method. Saw no exceptions in the error logs.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley, Korvin
Maniphest Tasks: T5695
Differential Revision: https://secure.phabricator.com/D10042
