‘Does the principle of effective judicial protection, set out in Article 30(2) of Directive 2004/38 (1), as interpreted in the light of Article 346(1)(a) of the Treaty on the Functioning of the European Union, require that a judicial body considering an appeal from a decision to exclude a European Union citizen from a member state on grounds of public policy and public security under Chapter VI of Directive 2004/38 ensure that the European Union citizen concerned is informed of the essence of the grounds against him, notwithstanding the fact that the authorities of the Member State and the relevant domestic court, after consideration of the totality of the evidence against the European Union citizen relied upon by the authorities of the Member State, conclude that the disclosure of the essence of the grounds against him would be contrary to the interests of state security?’