Update cherrpy to 17.4.2

lib/cherrypy/test/test_plugins.py

@@ -0,0 +1,14 @@
+from cherrypy.process import plugins
+
+
+__metaclass__ = type
+
+
+class TestAutoreloader:
+    def test_file_for_file_module_when_None(self):
+        """No error when module.__file__ is None.
+        """
+        class test_module:
+            __file__ = None
+
+        assert plugins.Autoreloader._file_for_file_module(test_module) is None