hotline : #145301 : registered add option empty

library/ZendAfi/Form/PreRegistration/Nanook.php

@@ -32,8 +32,7 @@ class ZendAfi_Form_PreRegistration_Nanook extends ZendAfi_Form {
       ->addElement('select',
                    'site',
                    ['label' => $this->_('Médiathèque'),
-                    'multiOptions' => array_merge([''],
-                                                  Class_IntBib::findAllNanookLabelsWithPreRegistration()),
+                    'multiOptions' => ['' => ''] + Class_IntBib::findAllNanookLabelsWithPreRegistration(),
                     'required' => true,
                     'allowEmpty' => false])