[longomatch] Fix crash with empty playlists

[Andoni Morales Alastruey <amorales src gnome org>]

commit 2d5ff6fe77461b96877516f1d7ebc212c9eedb84
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Mon Jun 17 12:57:13 2013 +0200

    Fix crash with empty playlists

 LongoMatch.Services/Services/PlaylistManager.cs |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/LongoMatch.Services/Services/PlaylistManager.cs b/LongoMatch.Services/Services/PlaylistManager.cs
index 5aaba80..515fa3e 100644
--- a/LongoMatch.Services/Services/PlaylistManager.cs
+++ b/LongoMatch.Services/Services/PlaylistManager.cs
@@ -172,6 +172,8 @@ namespace LongoMatch.Services
                protected virtual void OnRenderPlaylistEvent (IPlayList playlist)
                {
                        List<EditionJob> jobs = guiToolkit.ConfigureRenderingJob(playlist);
+                       if (jobs == null)
+                               return;
                        foreach (Job job in jobs)
                                videoRenderer.AddJob(job);
                }