fix for crash when running WM_OT_read_factory_settings() from a script and then importing.

source/blender/python/intern/bpy_operator.c

@@ -40,6 +40,7 @@
 #include "bpy_operator_wrap.h"
 #include "bpy_rna.h" /* for setting arg props only - pyrna_py_to_prop() */
 #include "bpy_util.h"
+#include "../generic/bpy_internal_import.h"
 
 #include "BLI_utildefines.h"
 
@@ -246,6 +247,8 @@ static PyObject *pyop_call(PyObject *UNUSED(self), PyObject *args)
 	 * function corrects bpy.data (internal Main pointer) */
 	BPY_modules_update(C);
 
+	/* needed for when WM_OT_read_factory_settings us called fro within a script */
+	bpy_import_main_set(CTX_data_main(C));
 
 	/* return operator_ret as a bpy enum */
 	return pyrna_enum_bitfield_to_py(operator_return_items, operator_ret);