getBlock method Null safety

Uint8List? getBlock(
  1. Uint8List id
)

Gets a serialized block by its id.

Implementation

Uint8List? getBlock(Uint8List id) {
  BlockModel? header = _blockService.get(id);
  if (header == null) return null;

  List<TransactionModel> transactions = _transactionService.getByBlock(id);
  if (transactions.isEmpty) return null;

  return _serializeBlock(header, transactions);
}