Case T-629/11: Order of the General Court of 25 October 2018 — Biogas Nord Anlagenbau v Commission (State aid — German tax legislation concerning the possibility of carrying losses forward to future tax years (Sanierungsklausel) — Decision declaring aid incompatible with the internal market — Annulment of the contested measure by the Court — Action which has become devoid of purpose — No need to adjudicate)