NullBooleanReads for play-json. Sometimes dirty json has a boolean of "null". This takes it to mean false

NullBooleanReads.scala

  implicit object NullBooleanReads extends Reads[Boolean] {
    def reads(json: JsValue): JsSuccess[Boolean] = json match {
      case JsBoolean(b) => JsSuccess(b)
      case _ => JsSuccess(false)
    }
  }