Fix an excessively aggressive transaction check in Owners

Summary: Fixes T10058. We don't need to continue on this check if no path changes are being applied.

Test Plan: Archived an owners package.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10058

Differential Revision: https://secure.phabricator.com/D14906

src/applications/owners/editor/PhabricatorOwnersPackageTransactionEditor.php

@@ -204,6 +204,10 @@ final class PhabricatorOwnersPackageTransactionEditor
         }
         break;
       case PhabricatorOwnersPackageTransaction::TYPE_PATHS:
+        if (!$xactions) {
+          continue;
+        }
+
         $old = mpull($object->getPaths(), 'getRef');
         foreach ($xactions as $xaction) {
           $new = $xaction->getNewValue();