code: async function() {
      const oThis = this
        , existingBrandedTokens = await oThis._loadBrandedTokenConfig()
      ;
      for (var uuid in existingBrandedTokens) {
        var brandedToken = existingBrandedTokens[uuid];
        if (oThis.btName.equalsIgnoreCase(brandedToken.Name)) {
          logger.error("* Branded token name already registered and present in BT config file");
          process.exit(1);
        }
        if (oThis.btSymbol.equalsIgnoreCase(brandedToken.Symbol)) {
          logger.error("* Branded token symbol already registered and present in BT config file");
          process.exit(1);
        }
      }
      return true;
    }
docs: Check for duplicate branded token
  
  @return {boolean}
  @private