message: fix: update synchronousPull example to avoid INVALID_ARGUMENT error
diff: @@ -68,13 +68,16 @@ function main(
  ackIds.push(message.ackId);
  }
  + if (ackIds.length !== 0) {
  // Acknowledge all of the messages. You could also ackknowledge
  // these individually, but this is more efficient.
  const ackRequest = {
  subscription: formattedSubscription,
  ackIds: ackIds,
  };
  +
  await subClient.acknowledge(ackRequest);
  + }
  console.log('Done.');
  }
  