message: Handle new Null type
diff: @@ -173,6 +173,9 @@ Status IndexKeyUtils::checkValue(const Value& v, bool isNullable) {
  case nebula::NullType::NaN : {
  return Status::Error("NaN");
  }
  + case nebula::NullType::OUT_OF_RANGE : {
  + return Status::Error("Out of range");
  + }
  }
  return Status::OK();
  }
  