[FIX] website: not setting domain is not empty domain

Previous versions of this action were setting a domain. Removing the
domain field, instead of setting it to empty value, have not the same
result for upgraded databases.

closes odoo/odoo#34454

Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

addons/website_sale/views/sale_order_views.xml

@@ -59,6 +59,7 @@
         <field name="name">Orders</field>
         <field name="res_model">sale.order</field>
         <field name="view_mode">tree,form,kanban,activity</field>
+        <field name="domain">[]</field>
         <field name="context">{'show_sale': True, 'search_default_order_confirmed': 1, 'search_default_from_website': 1}</field>
         <field name="search_view_id" ref="view_sales_order_filter_ecommerce"/>
         <field name="help" type="html">