Bug 11019 - Require some fields when adding authorized value category

Bug 11019 - Require some fields when adding authorized value category

This patch modifies the form for adding an authorized value so that
the category is a required fields.
Previously a new authorized value category could be saved with no data.

To test, apply the patch and go to Administration -> Authorized values.

- Click the "New category" button.
- Click the save button without filling in the category.
  You should be prevented from submitting the form.
- Verify that filling in the required field allows the form to be
  submitted.
- Perform the same test when editing an existing authorized value.

Signed-off-by: Aleisha Amohia <aleishaamohia@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Follow-up for QA: Allow a blank authorised value to be created.

Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Amended test plan.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>