[FIX] stock_account: Avoid divide by 0

closes odoo/odoo#43188

Related: odoo/enterprise#7676
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/stock_account/models/product.py

@@ -605,6 +605,9 @@ class ProductProduct(models.Model):
         """
         self.ensure_one()
 
+        if not qty_to_invoice:
+            return 0
+
         candidates = stock_moves\
             .sudo()\
             .mapped('stock_valuation_layer_ids')\