[FIX] point_of_sale: do not create empty picking for order with only service products

When confirming a pos order with only "service" products, an emtpy pos order is
created which stays in "draft" state forever.

Closes #7460

addons/point_of_sale/point_of_sale.py

@@ -790,6 +790,8 @@ class pos_order(osv.osv):
         move_obj = self.pool.get('stock.move')
 
         for order in self.browse(cr, uid, ids, context=context):
+            if all(t == 'service' for t in order.lines.mapped('product_id.type')):
+                continue
             addr = order.partner_id and partner_obj.address_get(cr, uid, [order.partner_id.id], ['delivery']) or {}
             picking_type = order.picking_type_id
             picking_id = False