[nautilus] Check for NULL when sorting columns

[Cosimo Cecchi <cosimoc src gnome org>]

commit 7da1601ba6288e48dc6ed3023de03fff04d20b2d
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Tue Apr 21 15:49:31 2009 +0200

    Check for NULL when sorting columns
    
    Check for a NULL value of the order array when sorting the columns.
    This might help when dealing with strange GConf setup issues (#524341).
---
 libnautilus-private/nautilus-column-utilities.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/libnautilus-private/nautilus-column-utilities.c b/libnautilus-private/nautilus-column-utilities.c
index 5c11ade..bc8c80b 100644
--- a/libnautilus-private/nautilus-column-utilities.c
+++ b/libnautilus-private/nautilus-column-utilities.c
@@ -250,6 +250,10 @@ GList *
 nautilus_sort_columns (GList  *columns, 
 		       char  **column_order)
 {
+	if (!column_order) {
+		return NULL;
+	}
+
 	return g_list_sort_with_data (columns,
 				      (GCompareDataFunc)column_compare,
 				      column_order);