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

src/applications/project/controller/PhabricatorProjectBoardViewController.php

@@ -68,7 +68,9 @@ final class PhabricatorProjectBoardViewController
     $columns = $column_query->execute();
     $columns = mpull($columns, null, 'getSequence');
 
-    if (empty($columns[0])) {
+    // TODO: Expand the checks here if we add the ability
+    // to hide the Backlog column
+    if (!$columns) {
       switch ($request->getStr('initialize-type')) {
         case 'backlog-only':
           $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();