Bug 16522: (follow-up) If no 773$w, try to return host record

Bug 16522: (follow-up) If no 773$w, try to return host record

Use host biblionumber or host itemnumber to return a host record if
EasyAnalyticalRecords is enabled, or return an undef record and a string
of host information when get_marc_host is called in list context.

Confirm tests pass:
- t/db_dependent/Koha/Biblio/host_record.t

Signed-off-by: Heather Hernandez <heather_hernandez@nps.gov>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>