docs: void sendDisplayError(HttpServletResponse response, String msgKey, Object... args) throws IOException {
          if (msgKey == null) {
              if (tc.isDebugEnabled()) {
                  Tr.debug(tc, "No message key was provided for sub-message, so no sub-message will be included");
              }
              msgKey = "";
          }
          String subMsg = Tr.formatMessage(tc, msgKey, args);
          Tr.error(tc, "ERROR_DISPLAYING_SIGN_IN_PAGE", subMsg);
          ErrorHandlerImpl.getInstance().handleErrorResponse(response);
      }