[gthumb] Fixed crash when changing the sorting order very fast

[Paolo Bacchilega <paobac src gnome org>]

commit 1ae1a7b1e4c514ce8fac5df0091c61ef706ff872
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Fri Aug 27 08:54:08 2010 +0200

    Fixed crash when changing the sorting order very fast
    
    [bug #628071]

 gthumb/gth-browser.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gthumb/gth-browser.c b/gthumb/gth-browser.c
index e18776f..10f908b 100644
--- a/gthumb/gth-browser.c
+++ b/gthumb/gth-browser.c
@@ -1273,13 +1273,13 @@ _gth_browser_set_sort_order (GthBrowser      *browser,
 				     inverse);
 	gth_browser_update_title (browser);
 
-	if (! browser->priv->constructed)
+	if (! browser->priv->constructed || (browser->priv->location == NULL))
 		return;
 
 	g_file_info_set_attribute_string (browser->priv->location->info, "sort::type", (sort_type != NULL) ? sort_type->name : "general::unsorted");
 	g_file_info_set_attribute_boolean (browser->priv->location->info, "sort::inverse", (sort_type != NULL) ? inverse : FALSE);
 
-	if (! save)
+	if (! save || (browser->priv->location_source == NULL))
 		return;
 
 	gth_file_source_write_metadata (browser->priv->location_source,