bpo-32033: Fix test_pwd failures on Android (GH-19502)

(cherry picked from commit 96515e9f6785328c52ebc5d4ce60e0087a9adc2d)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
diff --git a/Lib/test/test_pwd.py b/Lib/test/test_pwd.py
index c13a7c9..85740ce 100644
--- a/Lib/test/test_pwd.py
+++ b/Lib/test/test_pwd.py
@@ -21,7 +21,7 @@
             self.assertEqual(e[3], e.pw_gid)
             self.assertIsInstance(e.pw_gid, int)
             self.assertEqual(e[4], e.pw_gecos)
-            self.assertIsInstance(e.pw_gecos, str)
+            self.assertIn(type(e.pw_gecos), (str, type(None)))
             self.assertEqual(e[5], e.pw_dir)
             self.assertIsInstance(e.pw_dir, str)
             self.assertEqual(e[6], e.pw_shell)