Minor - validate user.

main/auth/resend_confirmation_mail.php

@@ -5,15 +5,19 @@ require_once __DIR__.'/../inc/global.inc.php';
 
 // Build the form
 $form = new FormValidator('resend');
-$form->addElement('header', get_lang('ReSendConfirmationMail'));
+$form->addHeader(get_lang('ReSendConfirmationMail'));
 $form->addText('user', get_lang('UserName'), true);
 $form->addButtonSend(get_lang('Send'));
 
 if ($form->validate()) {
     $values = $form->exportValues();
     $user = UserManager::getManager()->findUserByUsername($values['user']);
+    if ($user) {
+        UserManager::sendUserConfirmationMail($user);
+    } else {
+        Display::addFlash(Display::return_message(get_lang('UserDoesNotExist')));
+    }
 
-    UserManager::sendUserConfirmationMail($user);
     header('Location: '.api_get_path(WEB_PATH));
     exit;
 }