message: Fix listener removal in verification tile
  Fixes
diff: @@ -40,7 +40,10 @@ export default class MKeyVerificationConclusion extends React.Component {
  if (request) {
  request.off("change", this._onRequestChanged);
  }
  - MatrixClientPeg.removeListener("userTrustStatusChanged", this._onTrustChanged);
  + const cli = MatrixClientPeg.get();
  + if (cli) {
  + cli.removeListener("userTrustStatusChanged", this._onTrustChanged);
  + }
  }
  _onRequestChanged = () => {
  