Order modification: Remove warning when invoice is not yet generated (Z#23226423) (#5966)

src/pretix/presale/views/order.py

@@ -909,6 +909,21 @@ class OrderModify(EventViewMixin, OrderDetailMixin, OrderQuestionsViewMixin, Tem
     def get(self, request, *args, **kwargs):
         return super().get(request, *args, **kwargs)
 
+    def get_context_data(self, **kwargs):
+        ctx = super().get_context_data(
+            **kwargs,
+        )
+
+        ctx['invoice_generation_selfservice'] = (
+            self.request.event.settings.invoice_reissue_after_modify or
+            (
+                can_generate_invoice(self.request.event, self.order, ignore_payments=True) and
+                not self.order.invoices.exists()
+            )
+        )
+
+        return ctx
+
     def dispatch(self, request, *args, **kwargs):
         self.request = request
         self.kwargs = kwargs