#013155: ezcTreeXmlInternalDataStore::fetchDataForNode fetches data for wrong nodes

on line 77 of xml_internal.php:

$dataElem = $elem->getElementsByTagNameNS( 'http://components.ez.no/Tree/data', 'data' )->item( 0 );

if the current node has not "data" element, but has children that have it, no exception or error is raised, but the data from the first child is used (because of getElementsByTagNameNS definition).

EG:
<node id="Informazioni"><!--<etd:data>Informazioni</etd:data>-->
<node id="Press_Kit"><etd:data>Press Kit</etd:data></node>
</node>

Operating System:
PHP Version: (please be specific, like '4.4.3' or '5.1.5')
Database and version:
Browser (and version):