revert lost CHANGELOG-Message

Author: mariolorenz

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### FIX
 
 - [0007914](https://bugs.oxid-esales.com/view.php?id=7914): Fix Pay upon Invoice (PUI) broken after 3.7.1 security patch. The `executePayment()` reject guard blocked PUI because it matched `isPayPalPayment()` but was not handled by any prior flow (not a button/proxy/UAPM/checkout payment). Added `gatewaypayment` flag to `PayPalDefinitions` and `isGatewayPayment()` method so PUI correctly falls through to OXID's core `PaymentGateway`.
+- [0007915](https://bugs.oxid-esales.com/view.php?id=7915): Fix fatal error "Call to a member function getId() on null" on product detail page when an out-of-stock variant is in the basket. `hasProductVariantInBasket()` delegated to `Basket::getArtStockInBasket()` which calls `getArticle(true)` (buyable-check). For out-of-stock variants this returns null. Replaced with direct basket iteration using `getArticle(false)` to skip the buyable check.
 - Fix NoArticleException on product detail page when an out-of-stock variant (configured as "offline when sold out") is still in the basket. The installment banner template called `Basket::getArtStockInBasket()` which internally uses `getArticle(true)` and throws for offline articles. Simplified the banner amount calculation to always add the current product price to the basket total, removing the unnecessary basket iteration. Removed now unused `hasProductVariantInBasket()` method.
 - [0007916](https://bugs.oxid-esales.com/view.php?id=7916): Fix orphaned oscpaypal_order rows with OSCPAYPALSTATUS=COMPLETED and empty OXORDERID. When `sess_challenge` was cleared before `captureOrder()` completed (e.g. by a concurrent cancel request), the capture flow proceeded and created tracking records that could not be matched by webhook processing. Added defense-in-depth validation at four levels: `AjaxPaymentController::captureOrder()` now aborts if the shop order cannot be resolved, `PayPalOrderCompletedSubscriber` rejects events with empty shopOrderId, `Payment::trackPayPalOrder()` throws on empty shopOrderId, and `OrderRepository::paypalOrderByOrderIdAndPayPalId()` refuses to create new records with empty shopOrderId.
 - [0007917](https://bugs.oxid-esales.com/view.php?id=7917): Fix tracking carrier country not restored on page reload. When a carrier from the "global" country group was saved, the country dropdown was reset to the order's shipping/billing country instead. Added `getCountryCodeByCarrierKey()` to `PayPalTrackingCarrierList` and `getEffectiveTrackingCountryCode()` to `OrderMain` to resolve the saved carrier's country and pre-select it in the dropdown.