message: onValueChanging and onValueChanged behaves differently in cascade dropdowns scenario
diff: @@ -650,11 +650,12 @@ export class QuestionSelectBase extends Question {
  if (!!newValue && !this.isReadOnly) {
  var hasChanged = !Helpers.isTwoValueEquals(this.value, newValue.value);
  try {
  + if (!Helpers.isValueEmpty(newValue.value)) {
  this.allowNotifyValueChanged = false;
  this.locNotificationInData = true;
  this.value = undefined;
  this.locNotificationInData = false;
  -
  + }
  this.allowNotifyValueChanged = hasChanged;
  this.value = newValue.value;
  } finally {
  