Function removeEmptyOption

test/angular/1.5/angular.js:29560–29566

()

      };

      var removeEmptyOption = function() {
        if (!providedEmptyOption) {
          emptyOption.remove();
        } else if (emptyOptionRendered) {
          emptyOption.removeAttr('selected');
        }
      };

      var renderUnknownOption = function() {
        selectElement.prepend(unknownOption);