Bug 30708: Deal with deleted authorised value categories

Bug 30708: Deal with deleted authorised value categories

If a AV category is renamed or deleted, the app will freeze with
"TypeError: av_match is undefined"

To prevent that we add an check to prevent the freeze and a warning in
the settings.

We could eventually add a FK on option_source, but the idea was to let
it flexible in case we want to add another source.

This bug can be considered a configuration error anyway.

Sponsored-by: BULAC - http://www.bulac.fr/
Signed-off-by: BULAC - http://www.bulac.fr/
Signed-off-by: Heather Hernandez <heather_hernandez@nps.gov>
Signed-off-by: Laurence Rault <laurence.rault@biblibre.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>