Taylor Swift is “Safe & Sound” at Wembley Stadium. On Thursday, August 15, the pop princess, 33, took the stage in London a week after her concerts in Vienna were shockingly canceled due to a terrorist plot. Despite not directly addressing the harrowing incident — which left thousands of Swifties disappointed — Swift seemed to share a veiled message regarding the scare. “Ugh, feelings and emotions,” she told the crowd of 90,000 fans. “Feelings and emotions I didn’t think about before talking about it.” The Grammy winner has yet to address the cancelation of her three Vienna shows. As OK! previ…