'Required:
line -- line of text
Returns:
nothing
Logic:
Write an empty tag with attributes if there are attributes.
Otherwise, writen an empty tag with cell as element.'

def __empty_cell(self, line):

    if (len(self.__cell_list) > 0):
        self.__write_obj.write('mi<tg<empty-att_<cell')
        cell_dict = self.__cell_list[(-1)]
        keys = cell_dict.keys()
        for key in keys:
            self.__write_obj.write(('<%s>%s' % (key, cell_dict[key])))
        self.__write_obj.write('\n')
    else:
        self.__write_obj.write('mi<tg<empty_____<cell\n')
    self.__cells_in_table += 1
    self.__cells_in_row += 1
