From d36673cef5c5f35b1043a03e6c5ddbb7688788ae Mon Sep 17 00:00:00 2001
From: Radek Czajka <rczajka@rczajka.pl>
Date: Mon, 4 Jan 2016 13:19:51 +0100
Subject: [PATCH] Initial not None.

---
 src/catalogue/models/book.py                 | 2 +-
 src/catalogue/models/collection.py           | 2 +-
 src/catalogue/models/tag.py                  | 2 +-
 src/catalogue/templatetags/catalogue_tags.py | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/catalogue/models/book.py b/src/catalogue/models/book.py
index 1524c3456..9381afc94 100644
--- a/src/catalogue/models/book.py
+++ b/src/catalogue/models/book.py
@@ -100,7 +100,7 @@ class Book(models.Model):
         try:
             return re.search(r'\w', self.title, re.U).group(0)
         except AttributeError:
-            return None
+            return ''
 
     def author_str(self):
         return ", ".join(str(t) for t in self.tags.filter(category='author'))
diff --git a/src/catalogue/models/collection.py b/src/catalogue/models/collection.py
index bae1cc418..d51932841 100644
--- a/src/catalogue/models/collection.py
+++ b/src/catalogue/models/collection.py
@@ -33,7 +33,7 @@ class Collection(models.Model):
         try:
             return re.search(r'\w', self.title, re.U).group(0)
         except AttributeError:
-            return None
+            return ''
 
     @models.permalink
     def get_absolute_url(self):
diff --git a/src/catalogue/models/tag.py b/src/catalogue/models/tag.py
index 5575d6a14..89ca65185 100644
--- a/src/catalogue/models/tag.py
+++ b/src/catalogue/models/tag.py
@@ -134,7 +134,7 @@ class Tag(TagBase):
         elif self.name:
             return self.name[0]
         else:
-            return None
+            return ''
 
     @permalink
     def get_absolute_url(self):
diff --git a/src/catalogue/templatetags/catalogue_tags.py b/src/catalogue/templatetags/catalogue_tags.py
index fd914e321..ce23e548f 100644
--- a/src/catalogue/templatetags/catalogue_tags.py
+++ b/src/catalogue/templatetags/catalogue_tags.py
@@ -348,7 +348,7 @@ def work_list(context, object_list):
 
 @register.inclusion_tag('catalogue/plain_list.html', takes_context=True)
 def plain_list(context, object_list, with_initials=True, by_author=False, choice=None, book=None, gallery=False, paged=True):
-    names = [(None, [])]
+    names = [('', [])]
     last_initial = None
     for obj in object_list:
         if with_initials:
-- 
2.20.1