Increase a item in a HTML list.

        :param list_to_increase: The list.
        :type list_to_increase: str
        :param string_to_increase: The value of item.
        :type string_to_increase: str
        :return: The HTML list with the item added, if the item not was
                 contained in list.
        :rtype: str

def increase_in_list(list_to_increase, string_to_increase):
        """
        Increase a item in a HTML list.

        :param list_to_increase: The list.
        :type list_to_increase: str
        :param string_to_increase: The value of item.
        :type string_to_increase: str
        :return: The HTML list with the item added, if the item not was
                 contained in list.
        :rtype: str
        """

        if (bool(list_to_increase)) and (bool(string_to_increase)):
            if CommonFunctions.in_list(list_to_increase, string_to_increase):
                return list_to_increase
            return list_to_increase + ' ' + string_to_increase
        elif bool(list_to_increase):
            return list_to_increase
        return string_to_increase