Check whether configuration selection has the specified option.

		:param option_name: option name to check. If no option is specified, then check is made for this option

		:return: bool

def has_option(self, option_name=None):
		""" Check whether configuration selection has the specified option.

		:param option_name: option name to check. If no option is specified, then check is made for this option

		:return: bool
		"""
		if option_name is None:
			option_name = ''
		return self.config().has_option(self.section(), self.option_prefix() + option_name)