getDstTransaction method
Call get_dst_transaction of nekoton's transport and return option RawTransaction or throw error
Implementation
@override
Future<RawTransaction?> getDstTransaction(String messageHash) async {
if (_disposed) throw TransportCallAfterDisposeError();
final res = await transport.getDstTransaction(messageHash: messageHash);
return res == null ? null : RawTransaction.fromJson(jsonDecode(res));
}