From 4cd6f6f1f5f567eb03f07ec2d68d5bc6da09206d Mon Sep 17 00:00:00 2001
From: Charles Haley <cbhaley@i.wont.say.com>
Date: Fri, 19 Feb 2021 13:26:53 +0000
Subject: [PATCH] Fix bug in template 'for' where loop variables are not
 stripped.

---
 src/calibre/utils/formatter.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/utils/formatter.py b/src/calibre/utils/formatter.py
index 3f35684b35..b7aa3e8cc3 100644
--- a/src/calibre/utils/formatter.py
+++ b/src/calibre/utils/formatter.py
@@ -650,7 +650,7 @@ class _Interpreter(object):
             res = getattr(self.parent_book, f, f)
             if res is not None:
                 if not isinstance(res, list):
-                    res = res.split(',')
+                    res = [r.strip() for r in res.split(',') if r.strip()]
                 ret = ''
                 for x in res:
                     self.locals[v] = x