Case C-530/19: Judgment of the Court (Eighth Chamber) of 3 September 2020 (request for a preliminary ruling from the Oberster Gerichtshof — Austria) — NM, acting as liquidator of NIKI Luftfahrt GmbH v ON (Reference for a preliminary ruling — Air transport — Regulation (EC) No 261/2004 — Articles 5 and 9 — Obligation of the air carrier to offer hotel accommodation to passengers whose flights have been cancelled — Damage suffered by a passenger during her stay at the hotel providing the accommodation — Possibility of invoking the liability of the air carrier as a result of negligence on the part of employees of the hotel)