Bug 25303: Call ->reset before iterate on the set

In case we already started to iterate.

This fixes a failing tests in t/db_dependent/Koha/Biblios.t

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Koha/Objects.pm

@@ -182,6 +182,7 @@ sub delete {
     if ( Class::Inspector->function_exists( $self->object_class, 'delete' ) ) {
         my $objects_deleted;
         $self->_resultset->result_source->schema->txn_do( sub {
+            $self->reset; # If we iterated already over the set
             while ( my $o = $self->next ) {
                 $o->delete;
                 $objects_deleted++;