Handle case where template file doesn't exist. If a template file is a dangling symbolic link, it used to raise a "TypeError: 'NoneType' object is not iterable". Replace that useless error with a NoTemplate exception reporting the problem file.

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