[tracker] Tracker: fix possible dereference of null pointer

[Carlos Garnacho <carlosg src gnome org>]

commit 2a568fa218192ed50c5fe90304e8f83faf1f2cc2
Author: Haithem BEN GHORBAL <haithem benghorbal gmail com>
Date:   Mon Feb 8 16:21:49 2016 +0100

    Tracker: fix possible dereference of null pointer

 src/tracker/tracker-status.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/tracker/tracker-status.c b/src/tracker/tracker-status.c
index 69b044c..12b76d2 100644
--- a/src/tracker/tracker-status.c
+++ b/src/tracker/tracker-status.c
@@ -545,7 +545,7 @@ get_file_and_folder_count (int *files,
                if (error || !tracker_sparql_cursor_next (cursor, NULL, NULL)) {
                        g_printerr ("%s, %s\n",
                                    _("Could not get basic status for Tracker"),
-                                   error->message);
+                                   error ? error->message : _("No error given"));
                        g_error_free (error);
                        return EXIT_FAILURE;
                }