private @NotNull String buildText() {
    String text = myText;
    if (myException != null) {
      if (text == null) {
        text = buildExceptionStacktrace(myException);
      }
      else {
        text += "\n\n" + buildExceptionStacktrace(myException);
      }
    }
    if (text == null) {
      text = myTitle;
    }
    if (text == null) {
      assert myGroup != null;
      text = myGroup;
    }
    return text;
  }
private @NotNull String buildText()