dev#189214: Add managed libraries select in users edit/add form

library/ZendAfi/Form/Admin/User.php

@@ -163,7 +163,8 @@ class ZendAfi_Form_Admin_User extends ZendAfi_Form {
       $this->addElement('cochesSuggestion',
                         'managed_libraries',
                         ['label' => $this->_('Bibliothèque(s) gérée(s)'),
-                         'rubrique' => 'libraries']);
+                         'rubrique' => 'libraries',
+                         'selected_all_means_nothing' => false]);
 
 
     if (Class_Users::getIdentity()->isAdminBib() || Class_Users::getIdentity()->isAdmin())