Initialize static files' data hash only if needed (#8188)
Initialize static files' data hash only if needed (#8188)

Merge pull request 8188
jaybe-jekyll/jekyll,x-way/jekyll,fulldecent/jekyll,ryanshaw/jekyll,x-way/jekyll,jaybe-jekyll/jekyll,x-way/jekyll,fulldecent/jekyll,ryanshaw/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll,jekyll/jekyll,jekyll/jekyll,jekyll/jekyll,x-way/jekyll,ryanshaw/jekyll,jaybe-jekyll/jekyll,jekyll/jekyll,ryanshaw/jekyll,yhironaka/yhironaka.github.io,jaybe-jekyll/jekyll,chrisfinazzo/jekyll,chrisfinazzo/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll