[nautilus/gnome-3-20] application: protect against having no window

[Carlos Soriano Sánchez <csoriano src gnome org>]

commit 74dd46017d3c5a7e8ef18d3f5a5fbb9c4ea1d2a7
Author: Carlos Soriano <csoriano gnome org>
Date:   Tue Apr 26 10:32:34 2016 +0200

    application: protect against having no window
    
    If nautilus is run with --gapplication-service it has no active window
    active.
    
    We were assuming there is always a window active, and therefore nautilus
    was crashing if the active window was null.
    
    To fix it add some safe guards.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=765045

 src/nautilus-application.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)
---
diff --git a/src/nautilus-application.c b/src/nautilus-application.c
index 24afe97..4bc924d 100644
--- a/src/nautilus-application.c
+++ b/src/nautilus-application.c
@@ -338,7 +338,7 @@ nautilus_application_open_location_full (NautilusApplication     *self,
 {
         NautilusWindowSlot *active_slot;
         NautilusWindow *active_window;
-        GFile *old_location;
+        GFile *old_location = NULL;
        char *old_uri, *new_uri;
        gboolean use_same;
 
@@ -348,11 +348,16 @@ nautilus_application_open_location_full (NautilusApplication     *self,
          * so what we do is never rely on this on the callers, but would be cool to
         * make it work withouth explicitly setting the active window on the callers. */
         active_window = NAUTILUS_WINDOW (gtk_application_get_active_window (GTK_APPLICATION (self)));
-        active_slot = nautilus_window_get_active_slot (active_window);
+        /* There is no active window if the application is run with
+         * --gapplication-service
+         */
+        if (active_window) {
+                active_slot = nautilus_window_get_active_slot (active_window);
+                /* Just for debug.*/
+                old_location = nautilus_window_slot_get_location (active_slot);
+        }
 
-       /* Just for debug.*/
 
-       old_location = nautilus_window_slot_get_location (active_slot);
         /* this happens at startup */
         if (old_location == NULL)
                old_uri = g_strdup ("(none)");