def get_one_optional(self, locator):
        """
        Gets an optional component reference that matches specified locator.

        :param locator: the locator to find references by.

        :return: a matching component reference or null if nothing was found.
        """
        try:
            components = self.find(locator, False)
            return components[0] if len(components) > 0 else None
        except Exception as ex:
            return None