Bug 29387: Stringify exceptions for other background job modules

Signed-off-by: Joonas Kylmälä <joonas.kylmala@iki.fi>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Koha/BackgroundJob/BatchCancelHold.pm

@@ -94,7 +94,7 @@ sub process {
                 biblio_id    => defined $biblio ? $biblio->biblionumber : '',
                 hold_id      => $hold_id,
                 error        => defined $hold
-                ? ( $@ ? $@ : 0 )
+                ? ( $@ ? "$@" : 0 )
                 : 'hold_not_found',
               };
         }

Koha/BackgroundJob/BatchDeleteAuthority.pm

@@ -57,7 +57,7 @@ sub process {
                 type => 'error',
                 code => 'authority_not_deleted',
                 authid => $authid,
-                error => ($@ ? $@ : 0),
+                error => "$@",
             };
             $schema->storage->txn_rollback;
             next;

Koha/BackgroundJob/BatchDeleteBiblio.pm

@@ -101,7 +101,7 @@ sub process {
                     code => 'reserve_not_cancelled',
                     biblionumber => $biblionumber,
                     reserve_id => $hold->reserve_id,
-                    error => $@,
+                    error => "$@",
                 };
                 $schema->storage->txn_rollback;
                 $job->progress( ++$job_progress )->store;

Koha/BackgroundJob/BatchUpdateAuthority.pm

@@ -90,7 +90,7 @@ sub process {
                 type => 'error',
                 code => 'authority_not_modified',
                 authid => $authid,
-                error => ($@ ? $@ : 0),
+                error => ($@ ? "$@" : 0),
             };
         } else {
             push @messages, {