[grilo-plugins] tracker: fix crash with non per device mode

[Juan A. Suarez Romero <jasuarez src gnome org>]

commit 6163f8540b924e5ccba813cca6fff0d8881bdd9d
Author: Lionel Landwerlin <lionel g landwerlin linux intel com>
Date:   Wed Mar 16 15:48:16 2011 +0000

    tracker: fix crash with non per device mode
    
    Datasource wasn't set.
    
    Signed-off-by: Lionel Landwerlin <lionel g landwerlin linux intel com>

 src/media/tracker/grl-tracker-media.c |    1 +
 src/media/tracker/grl-tracker-utils.c |    3 ++-
 2 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/media/tracker/grl-tracker-media.c b/src/media/tracker/grl-tracker-media.c
index 03b222a..e5ccfff 100644
--- a/src/media/tracker/grl-tracker-media.c
+++ b/src/media/tracker/grl-tracker-media.c
@@ -85,6 +85,7 @@ grl_tracker_media_new (TrackerSparqlConnection *connection)
                        "source-name", GRL_TRACKER_MEDIA_NAME,
                        "source-desc", GRL_TRACKER_MEDIA_DESC,
                        "tracker-connection", connection,
+                       "tracker-datasource", "",
                        NULL);
 }
 
diff --git a/src/media/tracker/grl-tracker-utils.c b/src/media/tracker/grl-tracker-utils.c
index aacbb66..9f520cb 100644
--- a/src/media/tracker/grl-tracker-utils.c
+++ b/src/media/tracker/grl-tracker-utils.c
@@ -172,7 +172,8 @@ grl_tracker_key_is_supported (const GrlKeyID key)
 gchar *
 grl_tracker_media_get_device_constraint (GrlTrackerMediaPriv *priv)
 {
-  if (priv->tracker_datasource == NULL)
+  if (priv->tracker_datasource == NULL ||
+      priv->tracker_datasource[0] == '\0')
     return g_strdup ("");
 
   return g_strdup_printf ("?urn nie:dataSource <%s> .",