Index: astroid-1.6.1/astroid/tests/unittest_manager.py
===================================================================
--- astroid-1.6.1.orig/astroid/tests/unittest_manager.py
+++ astroid-1.6.1/astroid/tests/unittest_manager.py
@@ -136,7 +136,7 @@ class AstroidManagerTest(resources.SysPa
                 self.manager.ast_from_module_name('foogle.moogle')
         finally:
             del pkg_resources._namespace_packages['foogle'] # pylint: disable=no-member
-            sys.modules.pop('foogle')
+            sys.modules.pop('foogle', None)
 
     def test_namespace_and_file_mismatch(self):
         filepath = unittest.__file__