add placeholders for empty folders, fixes #250

static/js/folderPlaceholder.js

@@ -0,0 +1,21 @@
+// vim: et:ts=4:sw=4:sts=4:ft=javascript
+'use strict';
+pandora.ui.folderPlaceholder = function(id, section) {
+    var that = Ox.Element()
+            .addClass('OxLight')
+            .css({
+                height: '14px',
+                padding: '1px 4px',
+            });
+    that.updateText = function(string) {
+        return that.html(
+            Ox._(
+                string != 'volumes'
+                ? 'No ' + string + ' ' + (section == 'items' ? 'lists' : section)
+                : 'No local volumes'
+            )
+        );
+    };
+    return that.updateText(id);
+};
+