The original intent of it was for `if then else` and `try catch` as they aren't likely to be empty, but it accidentally caught function bodys, which have many valid reasons to be empty. Let's special case those out.
When looking into adding a test, I realized that the logic was inside of bin/prettier.js and therefore only applying to the cli. Moving it to index.js and adding a test so that it's more robust :)
Christopher Chedeau
