[latexila] Avoid critical message

[Sébastien Wilmet <swilmet src gnome org>]

commit 0c6fcbf65a4cd2ad950c1b0a8fc5a3a6fb567efb
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Sep 27 17:30:12 2013 +0200

    Avoid critical message
    
    Gtk-CRITICAL **: gtk_notebook_get_n_pages: assertion 'GTK_IS_NOTEBOOK (notebook)' failed

 src/document_view.vala |    1 +
 src/main_window.vala   |    5 +++++
 2 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/document_view.vala b/src/document_view.vala
index 2d4e784..3da3fbc 100644
--- a/src/document_view.vala
+++ b/src/document_view.vala
@@ -176,6 +176,7 @@ public class DocumentView : Gtk.SourceView
 
         GtkSpell.Checker checker = new GtkSpell.Checker ();
         checker.attach (this);
+        checker.decode_language_codes = true;
 
         try
         {
diff --git a/src/main_window.vala b/src/main_window.vala
index 93b3a99..a62b5b1 100644
--- a/src/main_window.vala
+++ b/src/main_window.vala
@@ -602,7 +602,12 @@ public class MainWindow : Window
     public Gee.List<DocumentView> get_views ()
     {
         Gee.List<DocumentView> all_views = new Gee.LinkedList<Document> ();
+
+        if (_documents_panel == null)
+            return all_views;
+
         int nb_documents = _documents_panel.get_n_pages ();
+
         for (int i = 0 ; i < nb_documents ; i++)
         {
             DocumentTab tab = _documents_panel.get_nth_page (i) as DocumentTab;