feature 3077 : factorize code for categories cache (TODO for other collections) + fix incorrect categories list for dissociation

git-svn-id: http://piwigo.org/svn/trunk@28542 68402e56-0260-453c-a942-63ccdbb3a9ee

include/ws_functions/pwg.categories.php

@@ -489,7 +489,7 @@ SELECT category_id, COUNT(*) AS counter
   $nb_images_of = query2array($query, 'category_id', 'counter');
 
   $query = '
-SELECT id, name, comment, uppercats, global_rank
+SELECT id, name, comment, uppercats, global_rank, dir
   FROM '. CATEGORIES_TABLE .'
 ;';
   $result = pwg_query($query);