Bug 29243: Correct call when adding items from staged records

Bug 29243: Correct call when adding items from staged records

To test:
1 - Populate system preference  NewItemsDefaultLocation
2 - Stage a file of marc records
3 - Create an acquisitions basket with 'AcqCreateItems' set to 'ordering'
4 - Attempt to add to basket from your staged file
5 - You get a 500 error, and in the logs:
    Can't use string ("") as a HASH ref while "strict refs" in use at /usr/share/koha/lib/C4/Items.pm line 1605.
6 - Apply patch
7 - Repeat #4
8 - Success!

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>