Can't make input empty after selecting place + validation issue

[BdanB]

Hey! We're using your module in our project, but we faced with such issue:

1. Our autocomplete field is not required, so when user select some place he can change his mind, erase it and leave empty, but we can't do so with your module, because on blur value is getting back to previous one. Temporary I just checking if modelCtrl.$viewValue is empty we don't setting viewValue. Can you consider to implement such option?
2. We're using vs-autocomplete-validator and field is invalid if empty.