fix bug that filter-map fails when called with multiple clists
fix bug that filter-map fails when called with multiple clists

koba-e964/picrin,leavesbnw/picrin,ktakashi/picrin,omasanori/picrin,omasanori/picrin,leavesbnw/picrin,koba-e964/picrin,koba-e964/picrin,ktakashi/picrin,dcurrie/picrin,picrin-scheme/picrin,leavesbnw/picrin,picrin-scheme/picrin,dcurrie/picrin,ktakashi/picrin