pkp/pkp-lib#10086 correct invalid nocontributor tag in onix export pl…

…ugin

plugins/importexport/onix30/filter/MonographONIX30XmlFilter.inc.php

@@ -357,7 +357,7 @@ function createProductNode($doc, $submission, $publicationFormat) {
 		}
 
 		if (sizeof($authors) == 0) { // this will probably never happen, but include the possibility.
-			$descDetailNode->appendChild($this->_buildTextNode($doc, 'NoContributor', '')); // empty state of fact.
+			$descDetailNode->appendChild($doc->createElementNS($deployment->getNamespace(), 'NoContributor')); // empty state of fact.
 		}
 
 		/* --- Add Language elements --- */