Bug 22602: Fix OverDrive circulation when coming from another site

Bug 22602: Fix OverDrive circulation when coming from another site

On bug 21078 we caught an error and returned, this makes us skip some variable setting that we need.

This patch moves that code into its own function.

To test:
0 - Have OverDrive circulation setup and working
1 - Place a link to your kohadev installation on another site
2 - Follow that link to the opac
3 - Note all items show as 'Place hold' even if available copies
4 - Apply patch
5 - Repeat 1&2
6 - Note the items availability shows correctly

Signed-off-by: Elizabeth Quinn <EQuinn@chplnj.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>