Fix Owners lookups for the repository root

Summary:
Ref T9201. At the root of a repository the current path is `null`, but the OwnersQuery wants strings.

This could be resolved a couple different ways, but just cast the arguments to strings since that seems reasonable enough.

Test Plan: Browsed root of a repository.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9201

Differential Revision: https://secure.phabricator.com/D13919

src/applications/diffusion/controller/DiffusionBrowseController.php

@@ -183,8 +183,6 @@ abstract class DiffusionBrowseController extends DiffusionController {
         $ownership = id(new PHUIStatusListView())
           ->setUser($viewer);
 
-
-
         foreach ($packages as $package) {
           $icon = 'fa-list-alt';
           $color = 'grey';

src/applications/owners/query/PhabricatorOwnersPackageQuery.php

@@ -42,6 +42,7 @@ final class PhabricatorOwnersPackageQuery
     }
 
     foreach ($paths as $path) {
+      $path = (string)$path;
       $this->controlMap[$repository_phid][$path] = $path;
     }
 
@@ -277,6 +278,8 @@ final class PhabricatorOwnersPackageQuery
    * @return list<PhabricatorOwnersPackage> List of controlling packages.
    */
   public function getControllingPackagesForPath($repository_phid, $path) {
+    $path = (string)$path;
+
     if (!isset($this->controlMap[$repository_phid][$path])) {
       throw new PhutilInvalidStateException('withControl');
     }