Bug 32478: (follow-up) UpdateItemLocationOnCheckin no longer needs flattening

Bug 32478: (follow-up) UpdateItemLocationOnCheckin no longer needs flattening

This patch removes a line flattening the arrays generated by get_yaml_pref_hash
as it is no longer necessary

Conditionals are adjusted to avoid warnings in tests

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 22d3c6121aa549edf89f1f5f1f8b1355271bbedb)
Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>