message: refactor: remove unnecessary optional chaining
diff: @@ -13,7 +13,7 @@ export class OperatorSubscriber<T> extends Subscriber<T> {
  if (onNext) {
  this._next = function (value: T) {
  try {
  - onNext?.(value);
  + onNext(value);
  } catch (err) {
  this.error(err);
  }
  