Fix missing EditEngineConfig on indirect pathway through conduit.query
Summary: Fixes T9772. We now need an EditEngineConfiguration to do interesting things with EditEngine, but this public API wasn't properly making sure we have one.
Test Plan: Called conduit.query from web console. Fatal prior to patch; success afterward.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T9772
Differential Revision: https://secure.phabricator.com/D14475