fix segfault when try to bring up a already exist scene_editor to the front with the command gfx_edit_scene. Tracker item 602
fix segfault when try to bring up a already exist scene_editor to the front with the command gfx_edit_scene. Tracker item 602

git-svn-id: 4705079bc6b8aadf675e3696f5c015a6aa4916e3@5566 3c1deb5b-d424-0410-962d-aba41a686d42

hsorby/zinc,hsorby/zinc,OpenCMISS/zinc,OpenCMISS/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,OpenCMISS/zinc