Revert r9859 as this killed the stream.

This isn't an easy fix, we need to stop using expat in namespace aware
mode.

src/common/xmpp/dispatcher_nb.py

@@ -132,13 +132,7 @@ class Dispatcher(PlugIn):
 			_pendingException = self._pendingExceptions.pop()
 			raise _pendingException[0], _pendingException[1], _pendingException[2]
 		try:
-			try:
-				self.Stream.Parse(data)
-			except ExpatError, (e):
-				if e[0][:14] == 'unbound prefix':
-					pass
-				else:
-					raise
+			self.Stream.Parse(data)
 			# end stream:stream tag received
 			if self.Stream and self.Stream.has_received_endtag():
 				self._owner.Connection.disconnect()