fix the order function causing an AttributeError on pre-1.2.1 Murmur servers

pyweb/mumble/mmobjects.py

@@ -25,10 +25,10 @@ from django.conf		import settings
 
 def cmp_channels( left, rite ):
 	""" Compare two channels, first by position, and if that equals, by name. """
+	if hasattr( left, "position" ) and hasattr( rite, "position" ):
 		byorder = cmp( left.position, rite.position );
 		if byorder != 0:
 			return byorder;
-	else:
 	return cmp_names( left, rite );
 
 def cmp_names( left, rite ):