From 79c9a8af9bee2f86002b0d8598b8695065f3256f Mon Sep 17 00:00:00 2001
From: Eric Lippmann <eric.lippmann@netways.de>
Date: Thu, 17 Sep 2015 12:52:09 +0200
Subject: [PATCH] lib: Fix Number::isValid(), again :)

---
 library/Icinga/Web/Form/Element/Number.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/Icinga/Web/Form/Element/Number.php b/library/Icinga/Web/Form/Element/Number.php
index 31bec6433..f7fa5292a 100644
--- a/library/Icinga/Web/Form/Element/Number.php
+++ b/library/Icinga/Web/Form/Element/Number.php
@@ -134,7 +134,7 @@ class Number extends FormElement
     {
         $this->setValue($value);
         $value = $this->getValue();
-        if ($this->isRequired() && ! is_numeric($value)) {
+        if ($value !== '' && ! is_numeric($value)) {
             $this->addError(sprintf(t('\'%s\' is not a valid number'), $value));
             return false;
         }