[totem] main: Fix possible warnings on startup

[Bastien Nocera <hadess src gnome org>]

commit ffefe928c08a9b7d9bf96087a97d930b0e5cc4ce
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Apr 11 18:31:49 2014 +0200

    main: Fix possible warnings on startup
    
    If a media isn't set in the store, skip the comparisons

 src/totem-grilo.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/totem-grilo.c b/src/totem-grilo.c
index 32cacec..88cac19 100644
--- a/src/totem-grilo.c
+++ b/src/totem-grilo.c
@@ -1100,6 +1100,9 @@ find_media_cb (GtkTreeModel  *model,
        gtk_tree_model_get (model, iter,
                            MODEL_RESULTS_CONTENT, &media,
                            -1);
+       if (!media)
+               return FALSE;
+
        if (g_strcmp0 (grl_media_get_id (media), grl_media_get_id (data->media)) == 0) {
                g_object_unref (media);
                data->found = TRUE;