From b571a4caa85bebf5a736ac1789b3ec4a51386631 Mon Sep 17 00:00:00 2001
From: Damien Elmes <git@ichi2.net>
Date: Mon, 22 Apr 2013 22:13:29 +0900
Subject: [PATCH] failure to find a field should not break entire query

https://anki.tenderapp.com/discussions/ankidesktop/656-unexpected-results-on-search-with-boolean-or-operator
---
 anki/find.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/anki/find.py b/anki/find.py
index 8e7949c3e..1daf4d3f7 100644
--- a/anki/find.py
+++ b/anki/find.py
@@ -429,7 +429,7 @@ where mid in %s and flds like ? escape '\\'""" % (
             except sre_constants.error:
                 return
         if not nids:
-            return
+            return "0"
         return "n.id in %s" % ids2str(nids)
 
 # Find and replace