[latexila] MainWindow: check active_view!=null in update_cursor_position_statusbar

[Sébastien Wilmet <swilmet src gnome org>]

commit bfc5105f4a0d05b9230d846fba12336f950c6cc0
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Aug 6 10:23:06 2017 +0200

    MainWindow: check active_view!=null in update_cursor_position_statusbar

 src/main_window.vala |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/main_window.vala b/src/main_window.vala
index f20a311..b8c20ac 100644
--- a/src/main_window.vala
+++ b/src/main_window.vala
@@ -955,6 +955,9 @@ public class MainWindow : ApplicationWindow
 
     private void update_cursor_position_statusbar ()
     {
+        if (active_view == null)
+            return;
+
         TextIter iter;
         active_document.get_iter_at_mark (out iter, active_document.get_insert ());
         int row = (int) iter.get_line ();