Case T-88/20: Judgment of the General Court of 6 October 2021 — Rivière and Others v Parliament (Institutional law — European Parliament — Measure adopted by the President of the European Parliament forbidding national flags being placed on the desks of Members of Parliament — Standards of conduct of Members of Parliament — Article 10(3) of the Parliament’s Rules of Procedure — Act not open to challenge — Inadmissibility)