From a60e2318ada695388cd71ae8f2100ad4129515ff Mon Sep 17 00:00:00 2001
From: Shannon <sdeminick@gmail.com>
Date: Mon, 17 Mar 2014 13:23:26 +1100
Subject: [PATCH] Fix Null Prevalue Values on Export of DataTypes

Exporting a DataType that has a Numeric pre-value that has no value
causes an Exception - added null checking to pre value.value
---
 src/Umbraco.Core/Services/PackagingService.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Umbraco.Core/Services/PackagingService.cs b/src/Umbraco.Core/Services/PackagingService.cs
index c06cec03fc..b8c854024b 100644
--- a/src/Umbraco.Core/Services/PackagingService.cs
+++ b/src/Umbraco.Core/Services/PackagingService.cs
@@ -700,7 +700,7 @@ namespace Umbraco.Core.Services
             {
                 var prevalue = new XElement("PreValue");
                 prevalue.Add(new XAttribute("Id", pv.Value.Id));
-                prevalue.Add(new XAttribute("Value", pv.Value.Value));
+                prevalue.Add(new XAttribute("Value", pv.Value.Value == null ? "" : pv.Value.Value));
                 prevalue.Add(new XAttribute("Alias", pv.Key));
                 prevalue.Add(new XAttribute("SortOrder", sort));
                 prevalues.Add(prevalue);