Do not raise self.skipTest().

skipTest() already raises an exception.

Lib/test/test_httpservers.py

@@ -340,8 +340,7 @@ class CGIHTTPServerTestCase(BaseTestCase):
             self.pythonexe.encode('utf-8')
         except UnicodeEncodeError:
             self.tearDown()
-            raise self.skipTest(
-                "Python executable path is not encodable to utf-8")
+            self.skipTest("Python executable path is not encodable to utf-8")
 
         self.file1_path = os.path.join(self.cgi_dir, 'file1.py')
         with open(self.file1_path, 'w', encoding='utf-8') as file1: