[gthumb] set the error if no script is available

[Paolo Bacchilega <paobac src gnome org>]

commit ae34efcde898fd849db692cf5fb8fe3d2e4657e0
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Fri Apr 30 23:05:46 2010 +0200

    set the error if no script is available

 gthumb/gnome-desktop-thumbnail.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gthumb/gnome-desktop-thumbnail.c b/gthumb/gnome-desktop-thumbnail.c
index d43ac15..a8544ee 100644
--- a/gthumb/gnome-desktop-thumbnail.c
+++ b/gthumb/gnome-desktop-thumbnail.c
@@ -832,8 +832,10 @@ gnome_desktop_thumbnail_factory_generate_from_script (GnomeDesktopThumbnailFacto
 	}
 	g_mutex_unlock (factory->priv->lock);
 
-	if (script == NULL)
+	if (script == NULL) {
+		*error = g_error_new_literal (G_IO_ERROR, G_IO_ERROR_FAILED, "No script");
 		return FALSE;
+	}
 
 	fd = g_file_open_tmp (".gnome_desktop_thumbnail.XXXXXX", tmpname, error);
 	if (fd == -1)