remove parentheses around arguments to raise (#6532)
remove parentheses around arguments to raise (#6532)

Merge pull request 6532
jekyll/jekyll,getandpost/jekyll.github.io,x-way/jekyll,tillgrallert/jekyll,x-way/jekyll,getandpost/jekyll.github.io,gencer/jekyll,fulldecent/jekyll,jaybe-jekyll/jekyll,gencer/jekyll,tillgrallert/jekyll,getandpost/jekyll.github.io,fulldecent/jekyll,Strangehill/jekyll,jaybe-jekyll/jekyll,fulldecent/jekyll,ryanshaw/jekyll,jaybe-jekyll/jekyll,ryanshaw/jekyll,x-way/jekyll,jekyll/jekyll,jekyll/jekyll,chrisfinazzo/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,ryanshaw/jekyll,fulldecent/jekyll,Strangehill/jekyll,gencer/jekyll,x-way/jekyll,yhironaka/yhironaka.github.io,tillgrallert/jekyll,chrisfinazzo/jekyll,gencer/jekyll,ryanshaw/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,Strangehill/jekyll,gencer/jekyll,Strangehill/jekyll,jekyll/jekyll,tillgrallert/jekyll,chrisfinazzo/jekyll