generate conf. token if the user doesn't have one

Controller/RegistrationConfirmationController.php

@@ -50,16 +50,17 @@ public function resendAction(Request $request, User $user = null)
                 $this->addFlash('warning', 'Your account is already enabled.');
             } else {
                 $this->addFlash('warning', 'The user is already enabled.');
-
             }
 
             return $this->redirect($redirect);
         }
 
         if (null === $user->getConfirmationToken()) {
-            throw new \InvalidArgumentException(
-                'The user does not have a confirmation token and therefore cannot be activated.'
+            $user->setConfirmationToken(
+                $this->get('fos_user.util.token_generator')
+                    ->generateToken()
             );
+            $this->get('fos_user.user_manager')->updateUser($user);
         }
 
         $this->get('fos_user.mailer')->sendConfirmationEmailMessage($user);
@@ -78,4 +79,4 @@ public function resendAction(Request $request, User $user = null)
 
         return $this->redirect($redirect);
     }
-}
+}