Check first if meshes have faces, otherwise don't do boolean op. (see: http://projects.blender.org/tracker/index.php?func=detail&aid=1065&group_id=9&atid=125)
Check first if meshes have faces, otherwise don't do boolean op. (see: http://projects.blender.org/tracker/index.php?func=detail&aid=1065&group_id=9&atid=125)