Actions for annulment - Action brought against a decision of the Commission initiating the procedure provided for in Article 88(2) EC - Adoption in the course of the proceedings of a decision finding national measures incompatible with the common market - Action for annulment brought against the second decision - Same applicants and same arguments - Judgment given on the second action - First action rendered devoid of purpose - No need to adjudicate (Arts 230 EC and 88(2) EC)