From d592d3c9d175c3365f679a9db387ffd4a87c4808 Mon Sep 17 00:00:00 2001
From: Charles Haley <>
Date: Thu, 29 Mar 2012 13:47:09 +0200
Subject: [PATCH] The value for is_multiple should never be left as None when
 an OPF is read. One consequence of leaving it None: text/non-multiple columns
 are not filled in when adding books using an OPF.

---
 src/calibre/ebooks/metadata/book/json_codec.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/calibre/ebooks/metadata/book/json_codec.py b/src/calibre/ebooks/metadata/book/json_codec.py
index c0c3900a5d..3b52821c1b 100644
--- a/src/calibre/ebooks/metadata/book/json_codec.py
+++ b/src/calibre/ebooks/metadata/book/json_codec.py
@@ -108,6 +108,8 @@ def decode_is_multiple(fm):
             else:
                 im = {'cache_to_list': '|', 'ui_to_list': ',',
                       'list_to_ui': ', '}
+        elif im is None:
+            im = {}
         fm['is_multiple'] = im
 
 class JsonCodec(object):