Clean undefined messages for tree view

pandora_console/include/javascript/tree/TreeController.js

@@ -976,6 +976,11 @@ var TreeController = {
                   "</span>"
               );
 
+              // Avoiding 'undefined' text.
+              if (typeof element.value === "undefined") {
+                element.value = "";
+              }
+
               // Value.
               $content.append(
                 '<span class="module-value">' + element.value + "</span>"

pandora_console/operation/tree.php

@@ -330,7 +330,7 @@ enterprise_hook('close_meta_frame');
 
 <script type="text/javascript">
     var treeController = TreeController.getController();
-    
+
     processTreeSearch();
     
     $("form#tree_search").submit(function(e) {