Bug 17307: Smaller counter-patch

Bug 17307: Smaller counter-patch

Given that the issue is trying to call a method on something that isn't
an object, because the category code doesn't exist, then why is it
even trying to change the expiry date? A simple postfix if fixes it.

Applied counter-patch by M. Tompsett. All three patron 'Edit' links
mentioned in previous patch's test plan work fine.

Signed-off-by: Andreas Roussos <arouss1980@gmail.com>
Signed-off-by: Benjamin Rokseth <benjamin.rokseth@kul.oslo.kommune.no>
Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>