Summary: We now show the inspirational quotes only when in list mode and viewing a tag. When you're viewing search results, or when you're in three-pane mode, you now see a more generic empty state.
Test Plan: No tests yet, may want to see if this refactor sticks when we start adding more empty states
Reviewers: evan
Reviewed By: evan
Differential Revision: https://phab.nylas.com/D1642
