Fix error message when exporting a write-only property without a setter
Fix error message when exporting a write-only property without a setter

(cherry picked from commit aca0cede679d2a500349baab2ad2f218f2ff0580)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot