From 9c9516834ca3db87bd7ebbde9243d9c05cc64237 Mon Sep 17 00:00:00 2001
From: Thomas Gelf <thomas@gelf.net>
Date: Thu, 21 Jul 2016 23:39:33 +0200
Subject: [PATCH] PropertyModifierSplit: allow null when empty

fixes #12060
---
 .../PropertyModifierSplit.php                 | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/library/Director/PropertyModifier/PropertyModifierSplit.php b/library/Director/PropertyModifier/PropertyModifierSplit.php
index e3f78bc3..4a6fef6b 100644
--- a/library/Director/PropertyModifier/PropertyModifierSplit.php
+++ b/library/Director/PropertyModifier/PropertyModifierSplit.php
@@ -16,10 +16,31 @@ class PropertyModifierSplit extends PropertyModifierHook
                 'One or more characters that should be used to split this string'
             )
         ));
+
+        $form->addElement('select', 'when_empty', array(
+            'label'       => $form->translate('When empty'),
+            'required'    => true,
+            'description' => $form->translate(
+                'What should happen when the given string is empty?'
+            ),
+            'value'        => 'empty_array',
+            'multiOptions' => $form->optionalEnum(array(
+                'empty_array' => $form->translate('return an empty array'),
+                'null'        => $form->translate('return NULL'),
+            ))
+        ));
     }
 
     public function transform($value)
     {
+        if (! strlen(trim($value))) {
+            if ($this->getSetting('when_empty', 'empty_array') === 'empty_array') {
+                return array();
+            } else {
+                return null;
+            }
+        }
+
         return preg_split(
             '/' . preg_quote($this->getSetting('delimiter'), '/') . '/',
             $value,