[gnome-photos] main-toolbar: Guard against being in a transitional state

[Debarshi Ray <debarshir src gnome org>]

commit 83b79b17b64c6499971a6b99f713147faceaf46c
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Mar 17 13:28:15 2014 +0100

    main-toolbar: Guard against being in a transitional state
    
    We going back from the preview, we first unset the active item in
    PhotosItemManager, and then change the window mode in
    PhotosModeController. If we ever reach this code in the middle of this
    transition, we should not crash.
    
    Fixes: https://bugzilla.gnome.org/726519

 src/photos-main-toolbar.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/photos-main-toolbar.c b/src/photos-main-toolbar.c
index 2f97217..fa6c1f4 100644
--- a/src/photos-main-toolbar.c
+++ b/src/photos-main-toolbar.c
@@ -132,7 +132,8 @@ photos_main_toolbar_set_toolbar_title (PhotosMainToolbar *self)
       GObject *item;
 
       item = photos_base_manager_get_active_object (priv->item_mngr);
-      primary = g_markup_printf_escaped ("%s", photos_base_item_get_name (PHOTOS_BASE_ITEM (item)));
+      if (item != NULL)
+        primary = g_markup_printf_escaped ("%s", photos_base_item_get_name (PHOTOS_BASE_ITEM (item)));
     }
 
   if (selection_mode)