Bug 9720 : uninitialized value warnings in circulation (followup 1)

Bug 9720 : uninitialized value warnings in circulation (followup 1)

This patch corrects several uninitialized value errors.

Test plan:
- Edit a borrower
- Enter a surname using lowercase (it will be displayed uppercase by CSS) and save
=> Borrower surname is uppercase
- Edit an organisation (depends on borrower category)
- Enter a surname using lowercase (it will be displayed uppercase by CSS) and save
=> Borrower surname is uppercase
- Go to a borrower page who has today issues
- Click on More/Export today's checked in barcodes
=> You get a file to dowload

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>