```ruby
module Edition::HtmlVersion
  extend ActiveSupport::Concern

  class Trait < Edition::Traits::Trait
    def process_associations_before_save(edition)
      return unless @edition.html_version
      attributes = @edition.html_version.attributes.except("id").merge(edition: edition)
      edition.html_version = HtmlVersion.new(attributes)
    end
  end

  included do
    has_one :html_version, foreign_key: :edition_id, dependent: :destroy
    accepts_nested_attributes_for :html_version, allow_destroy: true
    add_trait Trait
  end
end
```

Fix importer by adding back in the reject_if condition
user
```ruby
module Edition::HtmlVersion
  extend ActiveSupport::Concern

  class Trait < Edition::Traits::Trait
    def process_associations_before_save(edition)
      return unless @edition.html_version
      attributes = @edition.html_version.attributes.except("id").merge(edition: edition)
      edition.html_version = HtmlVersion.new(attributes)
    end
  end

  included do
    has_one :html_version, foreign_key: :edition_id, dependent: :destroy
    accepts_nested_attributes_for :html_version, allow_destroy: true, reject_if: :all_blank_or_empty_hashes
    add_trait Trait
  end
end
```
assistant