Fix bad query on PhameHome with no Blogs

Summary: We're checking for drafts even though we already know there are no blogs, just skip the query.

Test Plan: trucate phame_blogs; See proper blank state.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D14908

Author: Chad Little

src/applications/phame/controller/PhameHomeController.php

@@ -85,7 +85,7 @@ public function handleRequest(AphrontRequest $request) {
       ->setViewer($viewer);
 
     $draft_list = null;
-    if ($viewer->isLoggedIn()) {
+    if ($viewer->isLoggedIn() && $blogs) {
       $drafts = id(new PhamePostQuery())
         ->setViewer($viewer)
         ->withBloggerPHIDs(array($viewer->getPHID()))