Case T-639/16: Judgment of the General Court of 23 January 2018 — FV v Council (Appeal — Civil service — Officials — Appraisal — Career evaluation report — Appraisal year 2013 — Dismissal of action at first instance — Composition of the adjudicating Chamber which delivered the judgment at first instance — Procedure for the appointment of a judge to the Civil Service Tribunal — Tribunal established by law — Principle of the lawful judge)