[tasque/transition: 169/213] [libtasque] Make Backend.Refresh () virtual.

[Antonius Riha <antoniusri src gnome org>]

commit f1ad57e973a923253de33fe1be60d972737ddfbb
Author: Antonius Riha <antoniusriha gmail com>
Date:   Sat Aug 18 22:28:07 2012 +0200

    [libtasque] Make Backend.Refresh () virtual.

 src/libtasque/Backend.cs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/libtasque/Backend.cs b/src/libtasque/Backend.cs
index 0b4816b..a4e36f7 100644
--- a/src/libtasque/Backend.cs
+++ b/src/libtasque/Backend.cs
@@ -187,7 +187,7 @@ namespace Tasque
 		/// <summary>
 		/// Refreshes the backend.
 		/// </summary>
-		public abstract void Refresh ();
+		public virtual void Refresh () {}
 
 		protected abstract Task CreateTaskCore (string taskName);