Removes current completer.

        :return: Method success.
        :rtype: bool

def remove_completer(self):
        """
        Removes current completer.

        :return: Method success.
        :rtype: bool
        """

        if self.__completer:
            LOGGER.debug("> Removing '{0}' completer.".format(self.__completer))
            # Signals / Slots.
            self.__completer.activated.disconnect(self.__insert_completion)

            self.__completer.deleteLater()
            self.__completer = None
        return True