[gthumb] allow to set a NULL file_data without crasing

[Paolo Bacchilega <paobac src gnome org>]

commit 9a25f49bd9376853108422b613c25066c503229e
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Jan 9 16:02:53 2011 +0100

    allow to set a NULL file_data without crasing

 gthumb/gth-sidebar.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gthumb/gth-sidebar.c b/gthumb/gth-sidebar.c
index 87e1a07..3344cc9 100644
--- a/gthumb/gth-sidebar.c
+++ b/gthumb/gth-sidebar.c
@@ -152,7 +152,7 @@ gth_sidebar_set_file (GthSidebar  *sidebar,
 	GList *children;
 	GList *scan;
 
-	if (! g_file_info_get_attribute_boolean (file_data->info, "gth::file::is-modified"))
+	if ((file_data == NULL) || ! g_file_info_get_attribute_boolean (file_data->info, "gth::file::is-modified"))
 		gth_toolbox_deactivate_tool (GTH_TOOLBOX (sidebar->priv->toolbox));
 
 	children = gth_multipage_get_children (GTH_MULTIPAGE (sidebar->priv->properties));