Bug 16115: Remove JS error on item search if NOT_LOAN values do not exist

Bug 16115: Remove JS error on item search if NOT_LOAN values do not exist

If NOT_LOAN is not present, the item search form will raise a JS error:
SyntaxError: expected expression, got '}'

This patch fixes it by handling this specific case.

Note that the "Status" column is still displayed.

Test plan:
Remove your NOT_LOAN authorised values
Go on the item search form
=> You will not get the JS error and the "Status" bloc is no longer
displayed. There is no need to display it if empty.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>