fix(billing): skip zero-amount invoices (no lines) — drop empty move, don't post nothing

fusion_centralize_billing/wizards/invoice_ledger.py

@@ -171,6 +171,12 @@ class FusionBillingInvoiceLedgerWizard(models.TransientModel):
                             "account_id": self._fc_income_account("base").id,
                             "tax_ids": [(6, 0, tax.ids)] if tax else [(5, 0, 0)],
                         }))
+                    if not line_vals:
+                        # zero-amount invoice (no items, $0 subtotal) — nothing to record;
+                        # drop the empty move (whether just-created or a pre-existing draft).
+                        move.unlink()
+                        summary["skipped"].append({"id": nc_id, "reason": "zero-amount invoice"})
+                        continue
                     move.write({"invoice_line_ids": line_vals})
                     summary["updated" if existing else "created"] += 1
                     if post:
@@ -213,7 +219,7 @@ class FusionBillingInvoiceLedgerWizard(models.TransientModel):
                 continue
             mv = Move.search([("x_fc_nexacloud_invoice_id", "=", nc_id),
                               ("move_type", "=", "out_invoice")], limit=1)
-            if not mv:
+            if not mv or not mv.invoice_line_ids:
                 summary["skipped_missing"] += 1
                 continue
             try: