Fix Conpherence layout with setup issues

Summary: Make Conpherence usable when there is a setup issue as well. Fixes T3427

Test Plan: Test an ongoing thread, create a new thread. Test mobile and tablet layouts.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T3427

Differential Revision: https://secure.phabricator.com/D7669