Case T-379/18: Judgment of the General Court of 19 September 2019 — WI v Commission (Civil service — Pensions — Survivor’s pension — Registered non-marital partnership — Refusal to grant — Article 1(2)(c)(iv) of Annex VII of the Staff Regulation — Access to civil marriage — Principle of sound administration — Duty to have regard for the welfare of officials — Exceptional Circumstances)