Hi,
Normally, there is already a message "no records found" on the page. And you also have filters, a search input etc:
i.imgur.com/a492aYc.png
So it seems that your orders listing is already customized.
But I agree even the default look could be improved when no orders are found.
We'll work on that for the next version of HikaShop.
In the mean time, if you want to customize that, you'll need to edit the file order / listing via the menu Display>Views. However, it's not just one or two lines to add. So if you're not a developer, I would just recommend waiting for the next update of HikaShop in a few weeks.