Check for presence of any Columns before triggering initialization of Workboard
Summary: Ref T6256, this prevents more installs from getting in this weird state. We'll have to follow up if possible to "fix" the issue retroactively.
Test Plan: Test moving a backlog column to new position, hiding rest of other panels.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6256
Differential Revision: https://secure.phabricator.com/D10651