Merge remote-tracking branch 'origin/master'

libraries/navigation/Nodes/Node_Database.class.php

@@ -361,7 +361,7 @@ class Node_Database extends Node
 
         // Remove hidden items so that they are not displayed in navigation tree
         $cfgRelation = PMA_getRelationsParam();
-        if ($cfgRelation['navwork']) {
+        if (isset($cfgRelation['navwork']) && $cfgRelation['navwork']) {
             $navTable = PMA_Util::backquote($cfgRelation['db'])
                 . "." . PMA_Util::backquote($cfgRelation['navigationhiding']);
             $sqlQuery = "SELECT `item_name` FROM " . $navTable