Cannot add more item if list is not empty

[GaurangGhinaiya]

I have issue when i am trying to push new item in scope.

When I try to push new item in scope, it will update the scope but UI doesn't change. so i change in directive if (model && element.is(':empty')) {..} to if (model) { and its working fine. so my question is that is there any problem to removing it or there is another way to do this?.