Storer Communications, the television and cable company, had asked the Federal Communicatons Commission to block a group of dissident shareholders from working to elect its own slate of directors. The group, which contends that Storer stock is undervalued, wants to sell the company's assets. Storer contends that the group is trying to transfer control of the company and thus its broadcast licences, a move that requires FCC approval and lengthy hearings. The FCC ruled that no substantial change of control is involved. Storer said it would appeal.