real fix for Logic Bricks UI smart controller (#33746)

previous commit (54102) actually reintroduces an old bug where Blender sigfaults when
the sensor and controllers are not from the active object.

The real fix for report #33746 is to clear the "object" property after the operator ran.
I'm not sure why when I call the operator from command line the property is cleared, but not
when I called it from C. Either way all should be working now.

source/blender/editors/interface/interface_handlers.c

@@ -880,6 +880,7 @@ static void ui_add_smart_controller(bContext *C, uiBut *from, uiBut *to)
 	RNA_pointer_create((ID *)ob, &RNA_Object, ob, &object_ptr);
 	
 	WM_operator_properties_create(&props_ptr, "LOGIC_OT_controller_add");
+	RNA_string_set(&props_ptr, "object", ob->id.name + 2);
 
 	/* (3) add a new controller */
 	if (WM_operator_name_call(C, "LOGIC_OT_controller_add", WM_OP_EXEC_DEFAULT, &props_ptr) & OPERATOR_FINISHED) {

source/blender/editors/space_logic/logic_ops.c

@@ -424,6 +424,10 @@ static int controller_add_exec(bContext *C, wmOperator *op)
 	
 	WM_event_add_notifier(C, NC_LOGIC, NULL);
 
+	/* prevent the operator to get stuck with the "object" of the previous call -
+	 * it only happens when it's called from the "smart controller", see bug #54102 */
+	RNA_string_set(op->ptr, "object", "");	
+	
 	return OPERATOR_FINISHED;
 }