When NoStackTrace is one StackTrace too short

OnlyCauseStackTrace.scala

/**
 * Mix in this trait to suppress the StackTrace for the instance of the exception but not the cause,
 * scala.util.control.NoStackTrace suppresses all the StackTraces.
 */
trait OnlyCauseStackTrace { self: Throwable ⇒
  override def fillInStackTrace(): Throwable = {
    setStackTrace(getCause match {
      case null ⇒ Array.empty
      case some ⇒ some.getStackTrace
    })
    this
  }
}