Returns whether or not the inputed logger is tracked by this widget.
        
        :param      logger | <str> || <logging.Logger>

def hasLogger(self, logger):
        """
        Returns whether or not the inputed logger is tracked by this widget.
        
        :param      logger | <str> || <logging.Logger>
        """
        if isinstance(logger, logging.Logger):
            logger = logging.name
        
        return logger in self._loggers