die 'Need exactly one argument, either id, object or arrayref of ids or objects.' unless 2 == @_;
- return if !$data || ('ARRAY' eq ref $data && !@$data);
+ return $self if !$data || ('ARRAY' eq ref $data && !@$data);
$self->normalize_input($data);
- return unless @{ $self->oe_ids };
+ return $self unless @{ $self->oe_ids };
$self->calculate_item_links;
$self->calculate_fill_up if $self->fill_up;