[rygel/rygel-0-24] server,media-export: Fix album art extraction

[Jens Georg <jensgeorg src gnome org>]

commit e34b0a8af3355512b31af3456da1a79c4d8c69d4
Author: Jens Georg <mail jensge org>
Date:   Mon Nov 10 14:18:05 2014 +0100

    server,media-export: Fix album art extraction
    
    Signed-off-by: Jens Georg <mail jensge org>

 src/librygel-server/rygel-media-art-store.vala |   18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)
---
diff --git a/src/librygel-server/rygel-media-art-store.vala b/src/librygel-server/rygel-media-art-store.vala
index 5d939f1..6b5281b 100644
--- a/src/librygel-server/rygel-media-art-store.vala
+++ b/src/librygel-server/rygel-media-art-store.vala
@@ -113,8 +113,22 @@ public class Rygel.MediaArtStore : GLib.Object {
         }
 
         try {
-            media_art_process.buffer (MediaArt.Type.ALBUM, MediaArt.ProcessFlags.NONE, file,
-                                      data, item.mime_type, item.artist, item.album);
+            if (data != null) {
+                string? mime = null;
+                this.media_art_process.buffer (MediaArt.Type.ALBUM,
+                                               MediaArt.ProcessFlags.NONE,
+                                               file,
+                                               data,
+                                               mime,
+                                               item.artist,
+                                               item.album);
+            } else {
+                this.media_art_process.file (MediaArt.Type.ALBUM,
+                                             MediaArt.ProcessFlags.NONE,
+                                             file,
+                                             item.artist,
+                                             item.album);
+            }
         } catch (Error error) {
             warning ("%s", error.message);
         }