message: Add missing jsdoc
diff: @@ -407,12 +407,17 @@ export class TransactionBuilder extends BaseTransactionBuilder {
  return this._transfer;
  }
  + /**
  + * Returns the serialized sendMultiSig contract method data
  + *
  + * @returns {string} serialized sendMultiSig data
  + */
  private getSendData(): string {
  - if (this._transfer) {
  - return this._transfer.signAndBuild();
  - }
  + if (!this._transfer) {
  throw new BuildTransactionError('Missing transfer information');
  }
  + return this._transfer.signAndBuild();
  + }
  private buildSendTransaction(): TxData {
  const sendData = this.getSendData();
  