[gnome-calendar] year-view: fix bug when ListBoxRow child is NULL

[Erick Pérez Castellanos <erickpc src gnome org>]

commit 92ea54ac7b4209a93278454df58fbc05fe0101d8
Author: Erick Pérez Castellanos <erick red gmail com>
Date:   Tue Jan 20 17:15:17 2015 -0500

    year-view: fix bug when ListBoxRow child is NULL

 src/gcal-year-view.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/gcal-year-view.c b/src/gcal-year-view.c
index 2da206e..b71aa0c 100644
--- a/src/gcal-year-view.c
+++ b/src/gcal-year-view.c
@@ -361,6 +361,8 @@ update_sidebar_headers (GtkListBoxRow *row,
 
   priv = GCAL_YEAR_VIEW (user_data)->priv;
   row_child = gtk_bin_get_child (GTK_BIN (row));
+  if (row_child == NULL)
+    return;
   row_date = gcal_event_widget_peek_start_date (GCAL_EVENT_WIDGET (row_child));
   row_shift = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (row_child), "shift"));
   if (before != NULL)