[latexila] Build Tools: update actions' sensitivity when modified

[SÃbastien Wilmet <swilmet src gnome org>]

commit b406c738de5f16855205213fadb513191150605b
Author: SÃbastien Wilmet <swilmet src gnome org>
Date:   Sun Mar 4 00:33:24 2012 +0100

    Build Tools: update actions' sensitivity when modified
    
    When the build tools are modified (e.g. show/hide a build tool), the
    sensitivity of the build tools actions (the buttons on the main toolbar)
    was not updated correctly.

 src/main_window.vala |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/main_window.vala b/src/main_window.vala
index 7c5c51a..456f12e 100644
--- a/src/main_window.vala
+++ b/src/main_window.vala
@@ -212,7 +212,7 @@ public class MainWindow : Window
     {
         get
         {
-            if (documents_panel.get_n_pages () == 0)
+            if (documents_panel == null || documents_panel.get_n_pages () == 0)
                 return null;
             return documents_panel.active_tab;
         }
@@ -1221,6 +1221,7 @@ public class MainWindow : Window
         }
 
         build_tools_menu_ui_id = id;
+        update_build_tools_sensitivity ();
     }
 
     private void build_tools_menu_activate (Gtk.Action action)