Bug 19190: [Follow-up] Do not rely on the return of ModItem

Bug 19190: [Follow-up] Do not rely on the return of ModItem

touch_all_items looks at the return of ModItem to determine if the
operation was successful. But ModItem does not return a meaningful
value. This patch puts the ModItem call in an eval and looks at $@.

Test plan:
Run touch_all_items with a where condition and verbose option.
Put print 1/0; at the end of ModItem.
Run touch_all_items again. You should see: ERROR WITH ITEM xxx !!!!

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: David Bourgault <david.bourgault@inlibro.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>