Bug 29440: Make authorities import behavior consistent with biblios

Bug 29440: Make authorities import behavior consistent with biblios

The current behavior for when importing authorities, when match
option is enabled, is to insert as a new authority fetching from db
fails. This is both a bit confusing and not consistent with the biblio
case where an error is generated. Also clean up error and log messages
so both messages/errors and when messages/errors are issued are more
consistent for the biblio and authority case.

Signed-off-by: Frank Hansen <frank.hansen@ub.lu.se>
Signed-off-by: Michał Kula <148193449+mkibp@users.noreply.github.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>