environment,” Kardashian said of her refusal to work with Chyna. “On my own show, I have the power to do that.”Kardashian took the stand for an hour in a Los Angeles courtroom in a civil trial in which Chyna alleges that Kardashian and three other members of her family defamed Chyna and convinced producers and the E! network to cancel the spinoff show, “Rob & Chyna."Her testimony was mostly unremarkable — she spent much of it saying “I don’t remember” — but as the biggest star by far to testify in a trial full of stars, she caused a stir when she walked from the gallery to the witness stand wearing a dark gray pinstriped suit with white sneakers.