Replace a workaround with a more semantic one. - In old implementation, it has not clear intention in the syntax. - I move the line doing real works into the try-except block to emphasize the intention of skipping scene nodes that is incomplete.

// -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
// vim: sw=4:ts=8:sts=4
#ifndef __CONS_SUPP_H_
#define __CONS_SUPP_H_

typedef void *MB_WINDOW;
typedef void *MB_DISPLAY;

#endif