From 490d9c4b17d24286b0e6e4405c8dd6bbaa3e4c97 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 8 Nov 2011 07:53:30 +0530
Subject: [PATCH] Template language: Treay null author sort values the same as
 null author values. Fixes #887141 (Save to disk with unknown author breaks
 python & action fails.)

---
 src/calibre/library/save_to_disk.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/calibre/library/save_to_disk.py b/src/calibre/library/save_to_disk.py
index 69565e07d7..45d80839b2 100644
--- a/src/calibre/library/save_to_disk.py
+++ b/src/calibre/library/save_to_disk.py
@@ -173,6 +173,8 @@ def get_components(template, mi, id, timefmt='%b %Y', length=250,
     tsorder = tweaks['save_template_title_series_sorting']
     format_args = FORMAT_ARGS.copy()
     format_args.update(mi.all_non_none_fields())
+    if mi.is_null('author_sort'):
+        format_args['author_sort'] = _('Unknown')
     if mi.title:
         if tsorder == 'strictly_alphabetic':
             v = mi.title