[tracker] libtracker-direct: Fix shutdown after data manager error

[Carlos Garnacho <carlosg src gnome org>]

commit a9de32d01a5eb4715631af0d037c2814153acc53
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Nov 11 17:30:29 2018 +0100

    libtracker-direct: Fix shutdown after data manager error
    
    If the data manager errors out, trying to free the connection afterwards
    will trigger warnings trying to shut it down.

 src/libtracker-direct/tracker-direct.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/libtracker-direct/tracker-direct.c b/src/libtracker-direct/tracker-direct.c
index 674b8b7a5..3c54c7929 100644
--- a/src/libtracker-direct/tracker-direct.c
+++ b/src/libtracker-direct/tracker-direct.c
@@ -348,7 +348,8 @@ tracker_direct_connection_finalize (GObject *object)
        if (priv->select_pool)
                g_thread_pool_free (priv->select_pool, TRUE, FALSE);
 
-       tracker_data_manager_shutdown (priv->data_manager);
+       if (priv->data_manager)
+               tracker_data_manager_shutdown (priv->data_manager);
 
        g_clear_object (&priv->store);
        g_clear_object (&priv->journal);