[gtk+/gtk-3-22] placesview: fix testsuite

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 42aa4c138c5a1ef2aafba3bd4a2b0f55bc822b29
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Apr 11 16:46:14 2017 -0300

    placesview: fix testsuite
    
    Because the network monitor can perfectly be NULL,
    the tests were failing on that for GtkPlacesView
    always tries to disconnect this handler.
    
    Fix that by only disconnecting the handler when
    the network monitor exists.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781195

 gtk/gtkplacesview.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkplacesview.c b/gtk/gtkplacesview.c
index f4437b7..5c24a5f 100644
--- a/gtk/gtkplacesview.c
+++ b/gtk/gtkplacesview.c
@@ -398,7 +398,9 @@ gtk_places_view_destroy (GtkWidget *widget)
   priv->destroyed = 1;
 
   g_signal_handlers_disconnect_by_func (priv->volume_monitor, update_places, widget);
-  g_signal_handlers_disconnect_by_func (priv->network_monitor, update_places, widget);
+
+  if (priv->network_monitor)
+    g_signal_handlers_disconnect_by_func (priv->network_monitor, update_places, widget);
 
   g_cancellable_cancel (priv->cancellable);
   g_cancellable_cancel (priv->networks_fetching_cancellable);