[-] Classes : #PSFV-150 : BugFix : Configuration class check for NULL values

git-svn-id: http://dev.prestashop.com/svn/v1/branches/1.5.x@12102 b9a71923-0436-4b27-9f14-aed3839534dd

classes/Configuration.php

@@ -281,7 +281,7 @@ class ConfigurationCore extends ObjectModel
 		$result = true;
 		foreach ($values as $lang => $value)
 		{
-			if ($value == Configuration::get($key, $lang, $shopGroupID, $shopID))
+			if ($value === Configuration::get($key, $lang, $shopGroupID, $shopID))
 				continue;
 
 			// If key already exists, update value