[fix] erreur export achat

wizard/datas_export.py

@@ -234,7 +234,7 @@ class AccountDatasExport(http.Controller):
              '' AS auxiliaire,
              l.debit,
              l.credit,
-             (CASE WHEN l.name = '/' OR ''
+             (CASE WHEN l.name = '/' OR l.name = ''
               THEN p.name
               ELSE CONCAT('Facture ',i.number,' - ',l.name) END) AS libelle,
              i.number AS piece,