Adding back sys.exit on main

Author: pombredanne

about_code_tool/about.py

@@ -1514,4 +1514,4 @@ def format_option(self, option):
 if __name__ == '__main__':
     parser = get_parser()
     options, args = parser.parse_args()
-    main(parser, options, args)
+    sys.exit(main(parser, options, args))