[pdfmod] Fix a crash when the default RegionInfo is null

[Gabriel Burt <gburt src gnome org>]

commit 4dbe8cbbc7308fca545641dacfc4cfda320d1e5e
Author: Robert Dyer <psybers gmail com>
Date:   Wed Sep 30 15:16:53 2009 -0500

    Fix a crash when the default RegionInfo is null
    
    Fixes bgo#596912
    
    Signed-off-by: Gabriel Burt <gabriel burt gmail com>

 lib/PdfSharp/PdfSharp.Pdf/PdfPage.cs |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/lib/PdfSharp/PdfSharp.Pdf/PdfPage.cs b/lib/PdfSharp/PdfSharp.Pdf/PdfPage.cs
index 47434ad..e78fa1d 100644
--- a/lib/PdfSharp/PdfSharp.Pdf/PdfPage.cs
+++ b/lib/PdfSharp/PdfSharp.Pdf/PdfPage.cs
@@ -55,7 +55,7 @@ namespace PdfSharp.Pdf
       Elements.SetName(Keys.Type, "/Page");
 
       // TODO: Can I get default paper size from something like CultureInfo??
-      if (RegionInfo.CurrentRegion.IsMetric)
+      if (RegionInfo.CurrentRegion != null && RegionInfo.CurrentRegion.IsMetric)
         Size = PageSize.A4;
       else
         Size = PageSize.Letter;
@@ -72,7 +72,7 @@ namespace PdfSharp.Pdf
       Elements.SetName(Keys.Type, "/Page");
       Elements[PdfPage.Keys.Parent] = document.Pages.Reference;
 
-      if (RegionInfo.CurrentRegion.IsMetric)
+      if (RegionInfo.CurrentRegion != null && RegionInfo.CurrentRegion.IsMetric)
         Size = PageSize.A4;
       else
         Size = PageSize.Letter;