def sitemap_meta_canonical
      return controller.sitemap_meta_data[:canonical].blank? ? nil : tag(:link, {rel: :canonical, href: controller.sitemap_meta_data[:canonical]}, false, false)
    end
def sitemap_meta_canonical
      return controller.sitemap_meta_data[:canonical].blank? ? nil : tag(:link, {rel: :canonical, href: controller.sitemap_meta_data[:canonical]}, false, false)
    end
Generates a canonical link tag for use inside HTML header area.
 @return [String] HTML safe canonical link tag.