Bug 22343: (QA follow-up) Wrap email creation inside the try/catch block

Bug 22343: (QA follow-up) Wrap email creation inside the try/catch block

At a later development stage, exceptions where added for bad addresses.
This wasn't addressed in the controllers.

This patch makes the basket and list sending controller scripts move
email creation inside the try/catch block to handle those situations. It
also UTF-8 encodes the attached marc.

On broadly testing this I found that if the TT templates that are used
to build the email contains non-latin characters, those get
double-encoded. So this patch also removes an explicit encoding that is
done, which colides with Email::MIME implicit encoding.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>