[gnome-builder] theatrics: check for valid GdkWindow before invalidation

[Christian Hergert <chergert src gnome org>]

commit 5baf066a4951f5fa2256d89535d62b6d60e5f0bf
Author: Christian Hergert <christian hergert me>
Date:   Fri May 29 13:10:03 2015 -0700

    theatrics: check for valid GdkWindow before invalidation

 libide/theatrics/ide-box-theatric.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/libide/theatrics/ide-box-theatric.c b/libide/theatrics/ide-box-theatric.c
index b673d9a..bc18cb0 100644
--- a/libide/theatrics/ide-box-theatric.c
+++ b/libide/theatrics/ide-box-theatric.c
@@ -112,8 +112,11 @@ ide_box_theatric_notify (GObject    *object,
 
       window = gtk_widget_get_window (self->toplevel);
 
-      gdk_window_invalidate_rect (window, &self->last_area, TRUE);
-      gdk_window_invalidate_rect (window, &area, TRUE);
+      if (window != NULL)
+        {
+          gdk_window_invalidate_rect (window, &self->last_area, TRUE);
+          gdk_window_invalidate_rect (window, &area, TRUE);
+        }
     }
 }