[lisp/l/eusdebug.l] change assert API, message is optional
[lisp/l/eusdebug.l] change assert API, message is optional

wkentaro/EusLisp,bmagyar/EusLisp,aginika/EusLisp,aginika/EusLisp,wkentaro/EusLisp,aginika/EusLisp,bmagyar/EusLisp,bmagyar/EusLisp,wkentaro/EusLisp,aginika/EusLisp,wkentaro/EusLisp,bmagyar/EusLisp