From 9f2cf172f93f209745d37159a6bda0d1e9e432b1 Mon Sep 17 00:00:00 2001
From: Damien Elmes <git@ichi2.net>
Date: Wed, 4 Jul 2012 19:45:08 +0900
Subject: [PATCH] don't throw error when upgrading collection with unused
 models

---
 anki/upgrade.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/anki/upgrade.py b/anki/upgrade.py
index 874a8dfe3..b8804017a 100644
--- a/anki/upgrade.py
+++ b/anki/upgrade.py
@@ -600,7 +600,12 @@ and ord = ? limit 1""", m['id'], t['ord']):
                         remove.append(t)
                 del t['actv']
             for r in remove:
-                d.models.remTemplate(m, r)
+                try:
+                    d.models.remTemplate(m, r)
+                except AssertionError:
+                    # if the model was unused this could result in all
+                    # templates being removed; ignore error
+                    pass
             d.models.save(m)
 
     # Conditional templates