This is a continuation of rB39f005eae8eed8b939579aff8c9a05a4f50e5e38 Now all the fields where we check for object type in RNA (like rna_Curve_object_poll) will have a safe guard for when this isn't the case. For example when loading files that has missing object libraries and all missing objects are replaced with empties (placeholders). Reviewed By: Brecht Differential Revision: http://developer.blender.org/D5425