fix(core-flows): Allow return requests with no shipping (#8472)

Closes CC-265

packages/core/core-flows/src/order/workflows/return/confirm-return-request.ts

@@ -106,12 +106,8 @@ function prepareFulfillmentData({
 }
 
 function extractReturnShippingOptionId({ orderPreview, orderReturn }) {
-  if (!orderPreview.shipping_methods?.length) {
-    return
-  }
-
   let returnShippingMethod
-  for (const shippingMethod of orderPreview.shipping_methods) {
+  for (const shippingMethod of orderPreview.shipping_methods ?? []) {
     const modifiedShippingMethod_ = shippingMethod as any
     if (!modifiedShippingMethod_.actions) {
       continue
@@ -124,6 +120,11 @@ function extractReturnShippingOptionId({ orderPreview, orderReturn }) {
       )
     })
   }
+
+  if (!returnShippingMethod) {
+    return null
+  }
+
   return returnShippingMethod.shipping_option_id
 }