message: fix assertNoToasts
diff: @@ -17,8 +17,12 @@ limitations under the License.
  const assert = require('assert');
  async function assertNoToasts(session) {
  - const toast = await session.query('.mx_Toast_toast');
  - assert(!toast, 'toast found when none expected');
  + try {
  + await session.query('.mx_Toast_toast');
  + } catch (e) {
  + return;
  + }
  + throw new Error('toast found when none expected');
  }
  async function assertToast(session, expectedTitle) {
  