From 3a4344d1e26e679b0dc9558d15752e53ce86f8ac Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@archive.org>
Date: Tue, 23 Jun 2020 20:27:02 -0700
Subject: block some meta strings

---
 chocula/util.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/chocula/util.py b/chocula/util.py
index a52e1ec..ce48ab6 100644
--- a/chocula/util.py
+++ b/chocula/util.py
@@ -346,6 +346,9 @@ def clean_str(s: Optional[str]) -> Optional[str]:
     # non-sorting
     s.replace("\u02dc", "")
     s.replace("\u0153", "")
+    # there is a very samll chance this will filter out valid strings
+    if s.lower() in ("null", "n/a", "unknown"):
+        return None
     return s or None
 
 
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