Bug 19194: Check itemtype is defined when receiving an order

Bug 19194: Check itemtype is defined when receiving an order

To test:
1) Find a record with an item that has no itemtype (or remove the
itemtype of an item)
2) Go to Acquisitions -> Find a vendor or make a new one -> create a new
basket
3) Add the record from Step 1 to your basket
4) Close the basket
5) Go back to the vendor and click 'Receive shipments'
6) Put in an invoice number, click Next
7) Click the Receive link for your item
8) Confirm you see an internal server error
9) Apply the patch and refresh the page
10) The error should be gone and behaviour should continue as expected

Sponsored-by: Catalyst IT
Signed-off-by: Lee Jamison <ldjamison@marywood.edu>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>