Description:
------------
ImportNode don't treat namespace properly

Reproduce code:
---------------
<?php
// PHP 5.2.* namespace bug - A namespaced node loses its namespace on import if 
//		(i)  It has @xmlns=""
//		(ii) A namespaceURI of its parent's @xmlns

$aDOM= new DOMDocument();
$aDOM->appendChild($aDOM->createElementNS(' http://friend2friend.net ','f2f:a'));
echo 'DOM to add into is '.$aDOM->saveXML().chr(13);

$fromdom= DOMDocument::loadXML('<?xml version="1.0"?><f2f:data xmlns:f2f=" http://friend2friend.net "><f2f:servicereq xmlns=" http://friend2friend.net ">
<f2f:WATCH-MY-NAMESPACE xmlns=""/></f2f:servicereq></f2f:data>
');
echo 'Dom to import from is'.$fromdom->saveXML().chr(13);

$imported= $aDOM->importNode($fromdom->firstChild->firstChild, 1);
$aDOM->appendChild($imported);
echo 'Result is '.$aDOM->saveXML();
?>

Expected result:
----------------
Namespace should be preserved

Actual result:
--------------
Namespace gets lost