Don't try to load profile images for projects with no profile image

Summary: Ref T8631. Projects may not have a profile image PHID; don't try to load it if they don't.

Test Plan: Saw `WHERE phid IN ('')` query stop happening on a local feed story page.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T8631

Differential Revision: https://secure.phabricator.com/D13476

src/applications/project/query/PhabricatorProjectQuery.php

@@ -196,12 +196,18 @@ final class PhabricatorProjectQuery
       $default = null;
 
       $file_phids = mpull($projects, 'getProfileImagePHID');
-      $files = id(new PhabricatorFileQuery())
-        ->setParentQuery($this)
-        ->setViewer($this->getViewer())
-        ->withPHIDs($file_phids)
-        ->execute();
-      $files = mpull($files, null, 'getPHID');
+      $file_phids = array_filter($file_phids);
+      if ($file_phids) {
+        $files = id(new PhabricatorFileQuery())
+          ->setParentQuery($this)
+          ->setViewer($this->getViewer())
+          ->withPHIDs($file_phids)
+          ->execute();
+        $files = mpull($files, null, 'getPHID');
+      } else {
+        $files = array();
+      }
+
       foreach ($projects as $project) {
         $file = idx($files, $project->getProfileImagePHID());
         if (!$file) {