[dev] DataTree null

[Duck]

patch adds missing _init() method
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--- /root/horde/files/framework/DataTree/DataTree/null.php      2005-06-07 07:44:31.000000000 +0200
+++ null.php    2005-11-15 17:04:19.000000000 +0100
@@ -362,4 +362,13 @@
return true;
}

+    /**
+     * Init object
+     *
+     * @return boolean  True.
+     */
+    function _init()
+    {
+       return true;
+    }
}