Bug 23634: (QA follow-up) Catch all email cases in API

Bug 23634: (QA follow-up) Catch all email cases in API

The API was only catching the primary email change case, but we need to
catch email, emailpro and B_email.

We were also not accounting for any of the emails (on PUT or from the
DB) being undefined.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Aleisha Amohia <aleishaamohia@hotmail.com>
(cherry picked from commit 0a6f3e285ed2e792f1e49dfe85ff82bf12e61ded)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>