Remove unnecessary code from UrlHelper#link_to.

convert_options_to_data_attributes always returns not nil stringified html_options [#5445 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

actionpack/lib/action_view/helpers/url_helper.rb

@@ -235,13 +235,8 @@ def link_to(*args, &block)
           html_options = convert_options_to_data_attributes(options, html_options)
           url = url_for(options)
 
-          if html_options
-            html_options = html_options.stringify_keys
-            href = html_options['href']
-            tag_options = tag_options(html_options)
-          else
-            tag_options = nil
-          end
+          href = html_options['href']
+          tag_options = tag_options(html_options)
 
           href_attr = "href=\"#{html_escape(url)}\"" unless href
           "<a #{href_attr}#{tag_options}>#{html_escape(name || url)}</a>".html_safe