Torts — Medical malpractice — Indemnity — Relief from judgment — Where malpractice action was filed against doctor and her employer, employer filed cross-claim for indemnification against doctor, summary judgment was entered for employer on the indemnification claim, and jury subsequently returned verdict for doctor in trial that took place three years after the indemnity judgment, it would be inequitable to enforce indemnity judgment against doctor since she has been exonerated from liability — Trial court properly vacated indemnity summary judgment