fix: Do not fill budget line creation formset with already existing objects

cof_clubs/views.py

@@ -224,6 +224,11 @@ class BudgetLineMassCreate(BuroRequiredMixin, FormView):
 
     success_url = reverse_lazy("cof_clubs:club-list")
 
+    def get_form_kwargs(self):
+        kwargs = super().get_form_kwargs()
+        kwargs["queryset"] = ClubBudgetLine.objects.none()
+        return kwargs
+
     def get_common_form(self):
         kwargs = {
             "prefix": "common",