[bugfix] Do not try and undoAddValue if there is nothing to undo
[bugfix] Do not try and undoAddValue if there is nothing to undo

RemiKoutcherawy/exist,RemiKoutcherawy/exist,RemiKoutcherawy/exist,RemiKoutcherawy/exist,RemiKoutcherawy/exist,RemiKoutcherawy/exist