Case T-207/20: Judgment of the General Court of 15 September 2021 — Residencial Palladium v EUIPO — Palladium Gestión (PALLADIUM HOTELS & RESORTS) (EU trade mark — Invalidity proceedings — EU figurative mark PALLADIUM HOTELS & RESORTS — Admissibility criteria for an application for a declaration of invalidity — Article 53(4) of Regulation (EC) No 207/2009 (now Article 60(4) of Regulation (EU) 2017/1001) — Article 56(3) of Regulation No 207/2009 (now Article 63(3) of Regulation 2017/1001))