message: Check error_out is not nullptr before dereference it.
  Cr-Commit-Position: refs/heads/main@{#36427}
diff: @@ -53,8 +53,10 @@ bool TestPeer::SetRemoteDescription(
  RTC_LOG(LS_ERROR) << *params_->name
  << ": Failed to set remote description: "
  << observer->error().message();
  + if (error_out) {
  *error_out = observer->error().message();
  }
  + }
  return observer->error().ok();
  }
  