NULL pointer check on get_toplevel_window
NULL pointer check on get_toplevel_window


git-svn-id: 127a987e91cf1494982d7321442f532abf86480d@298 e8eb2e9a-03fc-0310-a997-8289724496f5

choehwanjin/imhangul,choehwanjin/imhangul,choehwanjin/imhangul