Case C-668/17 P: Judgment of the Court (Fourth Chamber) of 3 July 2019 — Viridis Pharmaceutical Ltd. v European Union Intellectual Property Office (EUIPO), Hecht-Pharma GmbH (Appeal — European Union trade mark — Revocation proceedings — Word mark Boswelan — No genuine use — Use of the mark in a clinical trial prior to filing an application for authorisation to place a medicinal product on the market — Proper reason for non-use — Concept)