'mirror_gpf_marker()' needs a NULL bGPDframe for initialization [but still requires a scene to get the marker]. Maniphest Tasks: T74837 Differential Revision: https://developer.blender.org/D7166
'mirror_gpf_marker()' needs a NULL bGPDframe for initialization [but still requires a scene to get the marker]. Maniphest Tasks: T74837 Differential Revision: https://developer.blender.org/D7166