odoo中pos模块由于删除partner导致发生（你试图访问的单据已经删除）错误的解决方法

push_order: function(order) {
            var self = this;

            if(order){
                this.proxy.log(‘push_order‘,order.export_as_JSON());
                this.db.add_order(order.export_as_JSON());
            }
            
            var pushed = new $.Deferred();

            this.flush_mutex.exec(function(){
                var flushed = self._flush_orders(self.db.get_orders());

                flushed.always(function(ids){
                    pushed.resolve();
                });
            });
            return pushed;
        },