From 0a02aa4827f05b23c751b917c2a6b5561f71d3de Mon Sep 17 00:00:00 2001
From: Charles Haley <cbhaley@i.wont.say.com>
Date: Sat, 12 Dec 2020 23:35:01 +0000
Subject: [PATCH] Throw away empty icon specifications in icon rule evaluation

---
 src/calibre/gui2/library/models.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/calibre/gui2/library/models.py b/src/calibre/gui2/library/models.py
index 6aa176292a..d82558c682 100644
--- a/src/calibre/gui2/library/models.py
+++ b/src/calibre/gui2/library/models.py
@@ -117,7 +117,8 @@ class ColumnIcon(object):  # {{{
                                     template_cache=template_cache)
                 if not rule_icons:
                     continue
-                icon_list = [ic.strip() for ic in rule_icons.split(':')]
+                icon_list = [ic.strip() for ic in rule_icons.split(':') if ic.strip()]
+                print(icon_list)
                 icons.extend(icon_list)
                 if icon_list and not kind.endswith('_composed'):
                     break