[nautilus] window-slot: protect against no new view

[Carlos Soriano Sánchez <csoriano src gnome org>]

commit 17e89f605c708e9d341308694eb770beb66dfbb7
Author: Carlos Soriano <csoriano gnome org>
Date:   Tue Jan 12 11:55:18 2016 +0100

    window-slot: protect against no new view
    
    If not a critical is raised.

 src/nautilus-window-slot.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/nautilus-window-slot.c b/src/nautilus-window-slot.c
index f775a14..762e746 100644
--- a/src/nautilus-window-slot.c
+++ b/src/nautilus-window-slot.c
@@ -2222,7 +2222,8 @@ nautilus_window_slot_switch_new_content_view (NautilusWindowSlot *slot)
        GtkWidget *widget;
         gboolean reusing_view;
 
-        reusing_view = gtk_widget_get_parent (GTK_WIDGET (slot->details->new_content_view)) != NULL;
+        reusing_view = slot->details->new_content_view &&
+                       gtk_widget_get_parent (GTK_WIDGET (slot->details->new_content_view)) != NULL;
         /* We are either reusing the view, so new_content_view and content_view
          * are the same, or the new_content_view is invalid */
         if (slot->details->new_content_view == NULL || reusing_view)