fix: use empty string instead of None for NOT NULL sale_id/promo_code_id

discount/init.py

@@ -1093,7 +1093,7 @@ async def save_customer_sale(request, params_kw):
             # Update existing binding
             await sor.U('discount_customer_bind', {
                 'id': bind_id,
-                'sale_id': sale_id or None,
+                'sale_id': sale_id or '',
             })
         else:
             # Create new binding for free customer
@@ -1102,7 +1102,7 @@ async def save_customer_sale(request, params_kw):
                 'id': new_id,
                 'customerid': customerid,
                 'resellerid': userorgid,
-                'sale_id': sale_id or None,
+                'sale_id': sale_id or '',
                 'promo_code_id': None,
                 'bind_type': '2',  # manual assignment
             })

wwwroot/api/init_free_customers.dspy

@@ -28,9 +28,9 @@ async with DBPools().sqlorContext('sage') as sor:
                 await disc_sor.C('discount_customer_bind', {
                     'id': getID(),
                     'customerid': u.id,
-                    'resellerid': userorgid,
-                    'sale_id': None,
-                    'promo_code_id': None,
+                    'resellerid': u.orgid or '0',
+                    'sale_id': '',
+                    'promo_code_id': '',
                     'bind_type': '3',
                 })
                 count += 1