From 1c30c6f644306c33c3afbc86440072b36130e8b2 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 14 Feb 2023 09:39:10 +0530
Subject: [PATCH] Fix a regression in calibre 5.0 that broke sorting the device
 view by title if one of the books has an empty title. Fixes #2007165 [Cannot
 sort device by title](https://bugs.launchpad.net/calibre/+bug/2007165)

More py3 goodness
---
 src/calibre/gui2/library/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/gui2/library/models.py b/src/calibre/gui2/library/models.py
index c76ca43a37..a01999dab3 100644
--- a/src/calibre/gui2/library/models.py
+++ b/src/calibre/gui2/library/models.py
@@ -1602,7 +1602,7 @@ class DeviceBooksModel(BooksModel):  # {{{
                 return ax
 
         keygen = {
-                'title': ('title_sorter', lambda x: sort_key(x) if x else ''),
+                'title': ('title_sorter', lambda x: sort_key(x) if x else b''),
                 'authors' : author_key,
                 'size' : ('size', int),
                 'timestamp': ('datetime', functools.partial(dt_factory, assume_utc=True)),