```ruby
require 'redcarpet'

module Spree
  module Retail
    class RedcarpetHTMLRenderer
      def initialize(options: {}, extensions: {})
        @options = options
        @extensions = extensions

        @renderer = Redcarpet::Render::HTML.new(default_options)
        @converter = Redcarpet::Markdown.new(@renderer, default_extensions)
      end

      def render(content)
        converter.render(content).strip
      end

      private

      attr_accessor :options, :extensions, :renderer, :converter

      def default_options
        {
          filter_html:     false,
          hard_wrap:       true,
          link_attributes: { rel: 'nofollow', target: '_blank' },
          space_after_headers: true,
          fenced_code_blocks: true,
          no_images: true,
          no_styles: true
        }.merge(options)
      end

      def default_extensions
        {
          autolink:           true,
          superscript:        true,
          disable_indented_code_blocks: true
        }.merge(extensions)
      end
    end
  end
end
```

Return an empty string if product's content is nil
user
```ruby
require 'redcarpet'

module Spree
  module Retail
    class RedcarpetHTMLRenderer
      def initialize(options: {}, extensions: {})
        @options = options
        @extensions = extensions

        @renderer = Redcarpet::Render::HTML.new(default_options)
        @converter = Redcarpet::Markdown.new(@renderer, default_extensions)
      end

      def render(content)
        return '' if content.nil?
        converter.render(content).strip
      end

      private

      attr_accessor :options, :extensions, :renderer, :converter

      def default_options
        {
          filter_html:     false,
          hard_wrap:       true,
          link_attributes: { rel: 'nofollow', target: '_blank' },
          space_after_headers: true,
          fenced_code_blocks: true,
          no_images: true,
          no_styles: true
        }.merge(options)
      end

      def default_extensions
        {
          autolink:           true,
          superscript:        true,
          disable_indented_code_blocks: true
        }.merge(extensions)
      end
    end
  end
end
```
assistant