message: Fix is empty value check for question's has-answer style
diff: @@ -500,7 +500,7 @@ export class Question extends SurveyElement
  if (!this.isFlowLayout && this.getTitleLocation() == "left") {
  res += " " + classes.titleLeftRoot;
  }
  - if (this.value) {
  + if (!this.isEmpty()) {
  res += " " + classes.hasAnswer;
  }
  if (this.errors.length > 0) {
  