From 002e20bcfe7e602875c8226032b3c5606f63e5fb Mon Sep 17 00:00:00 2001
From: Pierre <pierre-H@users.noreply.github.com>
Date: Thu, 25 Aug 2016 10:30:27 +0200
Subject: [PATCH] Fix EntityType->empty_data=null

Symfony 3.1, Doctine 2.5, PHP 7, SQL Server

With :
```
$builder
            ->add('users', EntityType::class, array(
                'label' => 'Users',
                'class' => 'AppBundle\Entity\Users',
                'choice_label' => 'name',
                'query_builder' => function (EntityRepository $er) {
                    return $er->createQueryBuilder('u')
                        ->orderBy('u.name', 'ASC');
                },
                'empty_data'  => null,
                'required' => false
            ))
```

I got an error :
SQLSTATE [42000, 8114]: [Microsoft][ODBC Driver 13 for SQL Server][SQL Server]Eror converting nvarchar datatype to numeric.
---
 .../Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php
index 9477d8265529d..3d14a7f969df6 100644
--- a/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php
+++ b/src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php
@@ -146,7 +146,7 @@ public function loadChoicesForValues(array $values, $value = null)
         // this was tested on, no exception was thrown for such invalid
         // statements, consequently no test fails when this code is removed.
         // https://github.com/symfony/symfony/pull/8981#issuecomment-24230557
-        if (empty($values)) {
+        if (empty($values) || $values === array('')) {
             return array();
         }