Fix test with Python 2.6.
(assertIsNotNone was introduced in Python 2.7 and 3.1.)
diff --git a/pym/portage/tests/util/test_getconfig.py b/pym/portage/tests/util/test_getconfig.py
index e7b638f..f1584c5 100644
--- a/pym/portage/tests/util/test_getconfig.py
+++ b/pym/portage/tests/util/test_getconfig.py
@@ -42,7 +42,7 @@
 			allow_sourcing=True, expand={"PORTAGE_BASE_PATH" : base})
 
 		# PASSES_SOURCING_TEST should exist in getconfig result
-		self.assertIsNotNone(d)
+		self.assertTrue(d is not None)
 		self.assertEqual("True", d['PASSES_SOURCING_TEST'])
 
 		# With allow_sourcing : True and empty expand map, this should