T6597, Uninstalled applications are still linked on Application launcher

Summary: Fixes T6597, Uninstalled applications should not be clickable when searching "All Applications" in the Applications launcher

Test Plan: Navigate too /applications/query/all, uninstall an application, navigate back to all applications. Uninstalled application title should not be clickable.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6597

Differential Revision: https://secure.phabricator.com/D11223

src/applications/meta/query/PhabricatorAppSearchEngine.php

@@ -228,7 +228,7 @@ final class PhabricatorAppSearchEngine
               ->setIcon('fa-cog')
               ->setHref('/applications/view/'.get_class($application).'/'));
 
-        if ($application->getBaseURI()) {
+        if ($application->getBaseURI() && $application->isInstalled()) {
           $item->setHref($application->getBaseURI());
         }