FORT WORTH, Texas — Bankrupt Atlanta-based energy company Mirant Corp. can have an additional eight months before filing its reorganization plan with the bankruptcy court, a judge here ruled Wednesday. In the course of arguing over the extension, though, a Mirant consultant delivered some bad news for stockholders: There will be no money left for them unless something changes before the case is done. When Mirant entered Chapter 11 last year, it looked as if there would be something left for shareholders once creditors got paid. The blow to shareholders came during questioning by U.S. Bankruptcy Court Judge Michael Lynn...