Carrie Underwood promises there is no bad blood between her and Nikki Glaser. Last month, online chatter revved up after the comedian appeared on “American Idol” as a guest judge, with fans speculating that there was tension between Underwood and Glaser. One fan wrote on Facebook, “Very obvious. Esp from Carrie. We have the extremes of 2 women. Carrie, no matter how talented, ever since I saw her on American idol, I pick up a really cold vibe,” according to the Daily Mail , while another wrote on X: “The tension between Carrie and Nikki is KILLING me lmaoo.” Carrie Underwood addressed online chatter that she had a problem with Nikki Glaser when the comedian appeared on “American Idol” in April. The comedian was a guest judge on “American Idol” last month, alongside Underwood. Disney via Getty Images Glaser filled in as fourth judge for the show’s first-ever Taylor Swift-themed night on April 27.…