Issue #3313475: Add an additional warning to the captcha example page, if the module is not configured

friendlycaptcha.module

@@ -5,6 +5,7 @@
  * Friendly Captcha integration module.
  */
 
+use Drupal\Core\Url;
 use Drupal\Core\Render\Markup;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\Template\Attribute;
@@ -108,6 +109,9 @@ function friendlycaptcha_captcha($op, $captcha_type = '') {
           ];
         }
         else {
+          if (\Drupal::currentUser()->hasPermission('administer friendlycaptcha')) {
+            \Drupal::messenger()->addWarning(t('Friendly captcha is not configured! Click <a href="@link">here</a> to configure Friendly Captcha. In the meantime challenge type "math" is used as the example fallback.', ['@link' => Url::fromRoute('friendlycaptcha.admin_settings_form')->toString()]));
+          }
           // Fallback to Math captcha as friendlycaptcha is not configured.
           $captcha = captcha_captcha('generate', 'Math');
         }