message: fix - billingInvoice.user is not set
diff: @@ -175,17 +175,18 @@ export default abstract class BillingIntegration {
  // Do not send notifications for invoices that are not yet finalized!
  if (billingInvoice.status === BillingInvoiceStatus.OPEN || billingInvoice.status === BillingInvoiceStatus.PAID) {
  // Send link to the user using our notification framework (link to the front-end + download)
  + const user = await UserStorage.getUser(this.tenant, billingInvoice.userID);
  // Stripe saves amount in cents
  const invoiceAmountAsDecimal = new Decimal(billingInvoice.amount).div(100);
  // Format amount with currency symbol depending on locale
  - const invoiceAmount = new Intl.NumberFormat(Utils.convertLocaleForCurrency(billingInvoice.user.locale), { style: 'currency', currency: billingInvoice.currency.toUpperCase() }).format(invoiceAmountAsDecimal.toNumber());
  + const invoiceAmount = new Intl.NumberFormat(Utils.convertLocaleForCurrency(user.locale), { style: 'currency', currency: billingInvoice.currency.toUpperCase() }).format(invoiceAmountAsDecimal.toNumber());
  // Send async notification
  void NotificationHandler.sendBillingNewInvoiceNotification(
  this.tenant,
  billingInvoice.id,
  - billingInvoice.user,
  + user,
  {
  - user: billingInvoice.user,
  + user,
  evseDashboardInvoiceURL: Utils.buildEvseBillingInvoicesURL(this.tenant.subdomain),
  evseDashboardURL: Utils.buildEvseURL(this.tenant.subdomain),
  invoiceDownloadUrl: Utils.buildEvseBillingDownloadInvoicesURL(this.tenant.subdomain, billingInvoice.id),
  