[FIX] purchase: do not create stock move for services

If a PO containing services contains at least one stockable/consumable
product, stock moves are generated for these services, which is not
correct.

addons/purchase/purchase.py

@@ -326,11 +326,10 @@ class PurchaseOrder(models.Model):
     @api.multi
     def _create_picking(self):
         for order in self:
-            ptypes = order.order_line.mapped('product_id.type')
-            if ('product' in ptypes) or ('consu' in ptypes):
+            if any([ptype in ['product', 'consu'] for ptype in order.order_line.mapped('product_id.type')]):
                 res = order._prepare_picking()
                 picking = self.env['stock.picking'].create(res)
-                moves = order.order_line._create_stock_moves(picking)
+                moves = order.order_line.filtered(lambda r: r.product_id.type in ['product', 'consu'])._create_stock_moves(picking)
                 moves.action_confirm()
                 moves.force_assign()
         return True