[f-spot] Avoid SQL error when importing files without description.

[Ruben Vermeersch <rubenv src gnome org>]

commit 161dbebff3b111ecdf615df50ab42622d62342f5
Author: Ruben Vermeersch <ruben savanne be>
Date:   Sun Jun 13 14:25:05 2010 +0200

    Avoid SQL error when importing files without description.

 src/PhotoStore.cs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/PhotoStore.cs b/src/PhotoStore.cs
index a88f82a..f44d26d 100644
--- a/src/PhotoStore.cs
+++ b/src/PhotoStore.cs
@@ -155,7 +155,7 @@ public class PhotoStore : DbStore<Photo> {
 				"time", unix_time,
 				"base_uri", item.DefaultVersion.BaseUri.ToString (),
 				"filename", item.DefaultVersion.Filename,
-				"description", description,
+				"description", description ?? String.Empty,
 				"roll_id", roll_id,
 				"default_version_id", Photo.OriginalVersionId,
 				"rating", "0"