Case T-259/15: Judgment of the General Court of 9 April 2019 — Close and Cegelec v Parliament (Public works contracts — Tender procedure — Construction of an energy unit — Extension and refurbishment of the Konrad Adenauer building in Luxembourg — Rejection of tender submitted by a tenderer — Award of the contract to another tenderer — Selection criteria — Financial and economic capacity — Technical and professional capacity — Obligation to state reasons — Manifest error of assessment)