Fixed #21992: Skipped test when pytz is missing.

The test fails on Windows when pytz is not installed.

django/contrib/humanize/tests.py

@@ -162,8 +162,7 @@ class HumanizeTests(TestCase):
         # As 24h of difference they will never be the same
         self.assertNotEqual(naturalday_one, naturalday_two)
 
-    @skipIf(settings.TIME_ZONE != "America/Chicago" and pytz is None,
-            "this test requires pytz when a non-default time zone is set")
+    @skipIf(pytz is None, "this test requires pytz")
     def test_naturalday_uses_localtime(self):
         # Regression for #18504
         # This is 2012-03-08HT19:30:00-06:00 in America/Chicago