message: Billing should not throw exception when no user is provided
diff: @@ -298,7 +298,7 @@ export default class OCPPUtils {
  }
  public static async processTransactionBilling(tenant: Tenant, transaction: Transaction, action: TransactionAction): Promise<void> {
  - if (transaction.user && !transaction.user.issuer) {
  + if (!transaction.user || !transaction.user.issuer) {
  return;
  }
  const billingImpl = await BillingFactory.getBillingImpl(tenant);
  