[gtkada] Add_From_File with null for Error.

[Pascal]

Hello,

About using:
   function Add_From_File
      (Builder  : not null access Gtk_Builder_Record;
       Filename : UTF8_String;
       Error    : access Glib.Error.GError) return Guint

As in C GTK programming, I put null for Error parameter thus I got:
Exception name: CONSTRAINT_ERROR
Message: gtk-builder.adb:149 access check failed

Here is a patch proposal:
--- ./gtk-builder.adb.0 2013-04-29 14:58:58.000000000 +0200
+++ ./gtk-builder.adb   2014-02-16 13:27:01.000000000 +0100
@@ -146,7 +146,9 @@
    begin
       Tmp_Return := Internal (Get_Object (Builder), Tmp_Filename, Acc_Error'Access);
       Free (Tmp_Filename);
-      Error.all := Acc_Error;
+      if Error /= null then
+         Error.all := Acc_Error;
+      end if;
       return Tmp_Return;
    end Add_From_File;

Maybe similar situations occur there:

./include/gnatcoll/gnatcoll-scripts-python.adb:1672:      Error.all := False;
./include/gnatcoll/gnatcoll-scripts-python.adb:1688:         Error.all := True;
./include/gnatcoll/gnatcoll-scripts-python.adb:1738:         Error.all := True;
./include/gnatcoll/gnatcoll-scripts-python.adb:1784:            Error.all := True;
./include/gnatcoll/gnatcoll-scripts-shell.adb:1953:      Error.all := False;
./include/gnatcoll/gnatcoll-scripts-shell.adb:2013:      Error.all := True;
./include/gnatcoll/gnatcoll-scripts-shell.adb:2029:      Error.all := True;
./include/gtkada/gtk-builder.adb:149:      Error.all := Acc_Error;
./include/gtkada/gtk-css_provider.adb:94:         Error.all := Acc_Error;
./include/gtkada/gtk-css_provider.adb:119:      Error.all := Acc_Error;
./include/gtkada/gtk-ui_manager.adb:130:      Error.all := Acc_Error;
./include/gtkada/gtk-ui_manager.adb:155:      Error.all := Acc_Error;

HTH, Pascal.
http://blady.pagesperso-orange.fr