Bug 16934 - Cannot add notes to canceled and deleted order line

Bug 16934 - Cannot add notes to canceled and deleted order line

Some librarians would like to be able to add notes to deleted order
lines to keep track of data such as what title the order line was for.
For some reason ModOrder dies if a biblionumber is passed in, even
though it does not use biblionumber and does not need it to exist in any
fashion! This limitation should be removed.

Test Plan:
1) Create a basket with an orderline
2) Cancel the order / delete the record
3) Click the "Add internal note" link for that order line
4) Fill in a note and click "Save"
5) Note the error
6) Apply this patch
7) Repeat steps 3-4
8) Note this time the note is saved!

Signed-off-by: Claire Gravely <c.gravely@arts.ac.uk>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>