[FIX] stock, purchase_stock: useless parent method

commit c914df5a36 introduced procurement
refactoring and a function _make_po_get_domain that is responsible to
forge a domain in order to find an existing PO that could append the
po line created by the procurement. However the function is defined in
stock and overriden in purchase_stock, purchase_requisition_stock,
mrp_mps(oe). All the module depends of purchase_stock and the method
in stock only return an empty tuple. So the method in stock could
be removed and the method in purchase_stock could become the new parent.

closes odoo/odoo#31580

Signed-off-by: "Simon Lejeune (sle)" <sle@openerp.com>

addons/purchase_stock/models/stock_rule.py

@@ -276,12 +276,11 @@ class StockRule(models.Model):
         }
 
     def _make_po_get_domain(self, company_id, values, partner):
-        domain = super(StockRule, self)._make_po_get_domain(company_id, values, partner)
         gpo = self.group_propagation_option
         group = (gpo == 'fixed' and self.group_id) or \
                 (gpo == 'propagate' and 'group_id' in values and values['group_id']) or False
 
-        domain += (
+        domain = (
             ('partner_id', '=', partner.id),
             ('state', '=', 'draft'),
             ('picking_type_id', '=', self.picking_type_id.id),

addons/stock/models/stock_rule.py

@@ -253,9 +253,6 @@ class StockRule(models.Model):
                 'res_model_id': self.env.ref('product.model_product_template').id,
             })
 
-    def _make_po_get_domain(self, company_id, values, partner):
-        return ()
-
 
 class ProcurementGroup(models.Model):
     """