bug: cleaner error message on OptionUnsetError in initialize We got a scary traceback when a: roundup.configuration.OptionUnsetError exception was raised during tracker.init(). Capture the exception and raise a UsageError that is printed more cleanly. It now reads: Error: In tracker/config.ini - MAIL_DOMAIN is not set and has no default

try:
    # Python 3+.
    from xmlrpc import client, server
    server.SimpleXMLRPCDispatcher
except (ImportError, AttributeError):
    # Python 2.
    import xmlrpclib as client  # noqa: F401
    import SimpleXMLRPCServer as server