message: add ignore comment node to GetFirstNonTextElement
diff: @@ -155,7 +155,7 @@ export class SurveyElement {
  public static GetFirstNonTextElement(elements: any) {
  if (!elements || !elements.length) return;
  for (var i = 0; i < elements.length; i++) {
  - if (elements[i].nodeName != "#text") return elements[i];
  + if (elements[i].nodeName != "#text" && elements[i].nodeName != "#comment") return elements[i];
  }
  return null;
  }
  