[gtk+] Avoid a warning out of the print dialog

[Matthias Clasen <matthiasc src gnome org>]

commit 32358a58f4a5da12a5b04faad7c02b634079d7b2
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Apr 8 20:46:57 2011 -0400

    Avoid a warning out of the print dialog
    
    Reported in https://bugzilla.gnome.org/show_bug.cgi?id=647152

 gtk/gtkprintunixdialog.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkprintunixdialog.c b/gtk/gtkprintunixdialog.c
index 0a7e6ac..f4a5049 100644
--- a/gtk/gtkprintunixdialog.c
+++ b/gtk/gtkprintunixdialog.c
@@ -1895,7 +1895,7 @@ selected_printer_changed (GtkTreeSelection   *selection,
 
   priv->printer_capabilities = 0;
 
-  if (gtk_printer_is_accepting_jobs (printer))
+  if (printer != NULL && gtk_printer_is_accepting_jobs (printer))
     gtk_dialog_set_response_sensitive (GTK_DIALOG (dialog), GTK_RESPONSE_OK, TRUE);
   priv->current_printer = printer;