Remove unnecessary empty checks from willFilterPage()

Summary: Fixes T3600. These checks are obsolete after D6512.

Test Plan: Syntax / static / inspection.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3600

Differential Revision: https://secure.phabricator.com/D6563

src/applications/macro/query/PhabricatorMacroQuery.php

@@ -157,10 +157,6 @@ final class PhabricatorMacroQuery
   }
 
   protected function willFilterPage(array $macros) {
-    if (!$macros) {
-      return array();
-    }
-
     $file_phids = mpull($macros, 'getFilePHID');
     $files = id(new PhabricatorFileQuery())
       ->setViewer($this->getViewer())