A federal appeals court threw out a $54-million judgment that a San Francisco man had won from Western Union Telegraph and reversed a verdict that the communications firm had run him out of business. Western Union did not engage in anti-competitive acts in failing to tell its Telex and TWX customers about communications equipment available from competitors such as Abraham Feldman, the court said. Feldman's terminal leasing companies went out of business 10 years ago. Feldman, who died earlier this year, won a $72-million judgment from Western Union in April, 1985. The award was later reduced to $54 million.