Update check to check for empty HTTP Response's body.
Update check to check for empty HTTP Response's body.

ChristopherDavenport/http4s,ChristopherDavenport/http4s,http4s/http4s,rossabaker/http4s,ChristopherDavenport/http4s,aeons/http4s,aeons/http4s,rossabaker/http4s,aeons/http4s