Allow upload_only to be nil.
Allow upload_only to be nil.

serixscorpio/serixscorpio.github.io,razor-x/jekyll-and-zurb,matthiasbeyer/wiki.template,rxfork/jekyll-and-zurb,razor-x/jekyll-and-zurb,matthiasbeyer/wiki.template,matthiasbeyer/wiki.template,rxfork/jekyll-and-zurb,razor-x/jekyll-and-zurb