Update Lib/xml/sax/expatreader.py

Co-authored-by: Sebastian Pipping <sebastian@pipping.org>

Author: ukarroum

Lib/xml/sax/expatreader.py

@@ -375,6 +375,9 @@ def start_element_ns(self, name, attrs):
             newattrs[apair] = value
             qnames[apair] = qname
 
+        if not self._namespace_prefixes:
+            elem_qname = None
+
         self._cont_handler.startElementNS(pair, elem_qname,
                                           AttributesNSImpl(newattrs, qnames))