SF bug 558179.
Change default for get() back to None.
Will backport to 2.2.1.
diff --git a/Lib/test/test_pyclbr.py b/Lib/test/test_pyclbr.py
index c745720..0f3319f 100644
--- a/Lib/test/test_pyclbr.py
+++ b/Lib/test/test_pyclbr.py
@@ -105,7 +105,7 @@
                                  '_isfunction',
                                  '_ismodule',
                                  '_classify_class_attrs'])
-        self.checkModule('rfc822')
+        self.checkModule('rfc822', ignore=["get"])
         self.checkModule('difflib')
 
     def test_others(self):