From 8d30c3434a973674b2b00b952b8f2d65678dfa57 Mon Sep 17 00:00:00 2001
From: GRiker <griker@hotmail.com>
Date: Sat, 8 Sep 2012 04:24:20 -0600
Subject: [PATCH] Handled condition when source book has no tags field.

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

diff --git a/src/calibre/library/catalogs/epub_mobi_builder.py b/src/calibre/library/catalogs/epub_mobi_builder.py
index c93b318966..3fc0df58b2 100644
--- a/src/calibre/library/catalogs/epub_mobi_builder.py
+++ b/src/calibre/library/catalogs/epub_mobi_builder.py
@@ -877,9 +877,11 @@ class CatalogBuilder(object):
 
             this_title['prefix'] = self.discover_prefix(record)
 
+            this_title['tags'] = []
             if record['tags']:
                 this_title['tags'] = self.filter_excluded_genres(record['tags'],
                                         self.opts.exclude_genre)
+
             if record['formats']:
                 formats = []
                 for format in record['formats']: