[rygel] media-export: Don't crash on file without streams

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 2ca4b473aa0d5d3d558c60964f352954514e9841
Author: Jens Georg <mail jensge org>
Date:   Fri Apr 15 23:27:00 2011 +0300

    media-export: Don't crash on file without streams

 .../media-export/rygel-media-export-item.vala      |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/media-export/rygel-media-export-item.vala b/src/plugins/media-export/rygel-media-export-item.vala
index fb5aad8..944a8c2 100644
--- a/src/plugins/media-export/rygel-media-export-item.vala
+++ b/src/plugins/media-export/rygel-media-export-item.vala
@@ -66,6 +66,14 @@ namespace Rygel.MediaExport.ItemFactory {
         audio_streams = dlna_info.info.get_audio_streams ();
         video_streams = dlna_info.info.get_video_streams ();
 
+        if (audio_streams == null && video_streams == null) {
+            debug ("%s had neither audio nor video/picture " +
+                   "streams. Ignoring.",
+                   file.get_uri ());
+
+            return null;
+        }
+
         if (audio_streams == null && video_streams.data.is_image()) {
             item = new PhotoItem (id, parent, "");
             return fill_photo_item (item as PhotoItem,