Also guard redirect_to url lookup against non-dynamic docs.
Also guard redirect_to url lookup against non-dynamic docs.

pathawks/jekyll-redirect-from,jekyll/jekyll-redirect-from,jekyll/jekyll-redirect-from,rowrz/jekyll-redirect-from,rowrz/jekyll-redirect-from,jekyll/jekyll-redirect-from,pathawks/jekyll-redirect-from