Nettoyage exception PDOException non lancée puisque qu'inexistante.

src/UnicaenAuth/Authentication/Adapter/Db.php

 <?php
+
 namespace UnicaenAuth\Authentication\Adapter;
 
-use PDOException;
-use Zend\ServiceManager\Exception\ServiceNotFoundException;
 use UnicaenAuth\Options\ModuleOptions;
+use Zend\ServiceManager\Exception\ServiceNotFoundException;
 use Zend\ServiceManager\ServiceManager;
 use Zend\ServiceManager\ServiceManagerAwareInterface;
 use ZfcUser\Authentication\Adapter\AdapterChainEvent as AuthEvent;
@@ -39,9 +39,6 @@ class Db extends \ZfcUser\Authentication\Adapter\Db implements ServiceManagerAwa
         try {
             $result = parent::authenticate($e);
         }
-        catch (PDOException $e) {
-            return false;
-        }
         catch (ServiceNotFoundException $e) {
             return false;
         }