[longomatch] Don't try to render a playlist if it's empty

[Andoni Morales Alastruey <amorales src gnome org>]

commit a2aea89c51727545cfa406b1a3debf5bd1e5f0c7
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Mon Jan 30 22:19:40 2012 +0100

    Don't try to render a playlist if it's empty

 LongoMatch.GUI/Gui/GUIToolkit.cs |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/LongoMatch.GUI/Gui/GUIToolkit.cs b/LongoMatch.GUI/Gui/GUIToolkit.cs
index 224b594..e7aba76 100644
--- a/LongoMatch.GUI/Gui/GUIToolkit.cs
+++ b/LongoMatch.GUI/Gui/GUIToolkit.cs
@@ -103,6 +103,11 @@ namespace LongoMatch.Gui
 			VideoEditionProperties vep;
 			Job job = null;
 			int response;
+			
+			if (playlist.Count == 0) {
+				WarningMessage(Catalog.GetString("The playlist you want to render is empty."));
+				return null;
+			}
 
 			vep = new VideoEditionProperties();
 			vep.TransientFor = mainWindow as Gtk.Window;