[nautilus/wip/ernestask/leak-plugging] tag-manager: Guard against null notifier

[Ernestas Kulik <ernestask src gnome org>]

commit a9b799adddb6a3e84446381328a311b6118566b9
Author: Ernestas Kulik <ernestask gnome org>
Date:   Sat Oct 6 19:57:09 2018 +0300

    tag-manager: Guard against null notifier
    
    tracker_notifier_new() may return a null pointer on error, and that’s
    exactly what happens sometimes (CI pipelines,
    https://gitlab.gnome.org/GNOME/tracker/issues/43).

 src/nautilus-tag-manager.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/src/nautilus-tag-manager.c b/src/nautilus-tag-manager.c
index de125ff77..891ad53f4 100644
--- a/src/nautilus-tag-manager.c
+++ b/src/nautilus-tag-manager.c
@@ -875,11 +875,13 @@ nautilus_tag_manager_set_cancellable (NautilusTagManager *self,
                                            TRACKER_NOTIFIER_FLAG_QUERY_LOCATION,
                                            cancellable,
                                            &self->notifier_error);
-
-    g_signal_connect (self->notifier,
-                      "events",
-                      G_CALLBACK (on_tracker_notifier_events),
-                      self);
+    if (self->notifier != NULL)
+    {
+        g_signal_connect (self->notifier,
+                          "events",
+                          G_CALLBACK (on_tracker_notifier_events),
+                          self);
+    }
 }
 
 static void