[rygel] media-export: map @refID to NULL

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 7a25e15dbf12b7da2caa6c9fbc94bdef42c7d70d
Author: Jens Georg <mail jensge org>
Date:   Sat Aug 28 20:01:58 2010 +0300

    media-export: map @refID to NULL
    
    This fixes IOP with WMP 12

 .../rygel-media-export-media-cache.vala            |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/media-export/rygel-media-export-media-cache.vala b/src/plugins/media-export/rygel-media-export-media-cache.vala
index ae87b4c..832de7d 100644
--- a/src/plugins/media-export/rygel-media-export-media-cache.vala
+++ b/src/plugins/media-export/rygel-media-export-media-cache.vala
@@ -680,6 +680,9 @@ public class Rygel.MediaExport.MediaCache : Object {
             case "res":
                 column = "o.uri";
                 break;
+            case "@refID":
+                column = "NULL";
+                break;
             case "@id":
                 column = "o.upnp_id";
                 break;