[Koha] Circulation-empty barcode-internal server error

[clint.deckard]

These are exactly the steps to recreate the issue in 16.05 although I 
hit enter rather than clicking the checkout button (same thing though).
Clint.

Owen Leonard wrote:
>> The error is
>> Can't use string ("1") as a HASH ref while "strict refs" in use at
>> /usr/share/koha/intranet/cgi-bin/circ/circulation.pl line 472.
> 
> My library has this problem too, in our production installation of 3.22.08.
> 
> 1. Set the  CircAutoPrintQuickSlip system preference to "clear the screen."
> 2. Load a patron's account in circulation.
> 3. Click the "Checkout" button with an empty barcode field.
> 
>   -- Owen
>