[Koha] Checking out with no barcode opens a print dialog

[Chris Brown]

Gentle Reader,

We have noticed a strange behaviour in Koha 17.05 and 17.11 when checking
books out. If you select a patron, then click "Check out" without entering
an item barcode, a new window opens with a printer dialog to print a list
of the books checked out.

Is this considered a feature or a bug? It certainly took us by surprise!

Best Regards,

Chris Brown