Bug 34014: (follow-up) No need to parse old record before updating

Bug 34014: (follow-up) No need to parse old record before updating

If the old record doesn't parse correctly it will cause a failure - the check is just to ensure we
are editing an existing biblio, just getting the metadata object should confirm it exists

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Kelly McElligott <kelly@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit e8b66cadf2e2e313663544d3978e9c8b1ddeba32)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>