Fix issue if MBK forms is not setup correctly

mbk_forms/runtime.php

@@ -7,16 +7,17 @@ function mbk_forms_form_handler($form) {
   $Settings = $API->get('Settings');
   $data = $form->data;
   $responseKey = null;
+  $secretKey = $Settings->get('mbk_forms_recaptcha_secret_key')->val();
 
   // This is what the widget returns when submitting the form
   if(isset($data['g-recaptcha-response'])) {
     $responseKey = $data['g-recaptcha-response'];
   }
 
-  $recaptcha = new \ReCaptcha\ReCaptcha($Settings->get('mbk_forms_recaptcha_secret_key')->val());
+  $recaptcha = new \ReCaptcha\ReCaptcha($secretKey);
   $response = $recaptcha->verify($responseKey, $_SERVER['REMOTE_ADDR']);
 
-  if (!$response->isSuccess()) {
+  if ($responseKey && $secretKey && !$response->isSuccess()) {
     $form->data[$Settings->get('mbk_forms_honeypot_name')->val()] = 'Failed captcha';
   }
 
@@ -47,4 +48,4 @@ function mbk_forms_form_handler($form) {
       $form->redispatch($app);
     }
   }
-}
+}