pref-feeds: apply patch by gmargo@forum to show/hide empty categories

js/prefs.js

@@ -1635,6 +1635,21 @@ function resetCatOrder() {
 	}
 }
 
+function toggleHiddenFeedCats() {
+	try {
+		notify_progress("Loading, please wait...");
+
+		new Ajax.Request("backend.php", {
+			parameters: "?op=pref-feeds&method=togglehiddenfeedcats",
+			onComplete: function(transport) {
+		  		updateFeedList();
+			} });
+
+	} catch (e) {
+		exception_error("toggleHiddenFeedCats");
+	}
+}
+
 function editCat(id, item, event) {
 	try {
 		var new_name = prompt(__('Rename category to:'), item.name);