viewclass: fixed error when specified 'option' and not specified 'default'
viewclass: fixed error when specified 'option' and not specified 'default'

TomoakiNagahara/ethna,riaf/ethna,withgod/ethna,TomoakiNagahara/ethna,ethnamphp/getopt,ethna/ethna,riaf/ethna,ethnamphp/generator