From ac4c087d98d71f715ae61a7eca4412ea7fa3e221 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Wed, 19 Apr 2023 16:06:51 +0200
Subject: [PATCH] Add empty option for taxon rank

Closes #12228
(grafted from efa359afaf8b3f2169f4ba4ffb7866e1e6337b56)

--HG--
branch : 6.0
---
 modules/product_classification_taxonomic/product.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/product_classification_taxonomic/product.py b/modules/product_classification_taxonomic/product.py
index ecd29b686b..d102618fe0 100644
--- a/modules/product_classification_taxonomic/product.py
+++ b/modules/product_classification_taxonomic/product.py
@@ -20,6 +20,7 @@ class Taxon(classification_tree('product.taxon'), ModelSQL, ModelView):
     'Taxon'
     __name__ = 'product.taxon'
     rank = fields.Selection([
+            (None, ""),
             ('domain', 'Domain'),
             ('kingdom', 'Kingdom'),
             ('phylum', 'Phylum'),