Added custom error pages

src/pretix/control/views/item.py

@@ -4,7 +4,7 @@ from django.contrib import messages
 from django.core.urlresolvers import resolve, reverse
 from django.db import transaction
 from django.forms.models import inlineformset_factory
-from django.http import Http404, HttpResponseForbidden, HttpResponseRedirect
+from django.http import Http404, HttpResponseRedirect
 from django.shortcuts import redirect
 from django.utils.functional import cached_property
 from django.utils.translation import ugettext_lazy as _
@@ -380,7 +380,8 @@ class PropertyDelete(EventPermissionRequiredMixin, DeleteView):
             messages.success(request, _('The selected property has been deleted.'))
             return HttpResponseRedirect(success_url)
         else:
-            return HttpResponseForbidden()
+            messages.error(request, _('The selected property can not be deleted.'))
+            return HttpResponseRedirect(self.get_success_url())
 
     def get_success_url(self) -> str:
         return reverse('control:event.items.properties', kwargs={

src/pretix/control/views/organizer.py

@@ -1,6 +1,6 @@
 from django.contrib import messages
+from django.core.exceptions import PermissionDenied
 from django.core.urlresolvers import reverse
-from django.http import HttpResponseForbidden
 from django.utils.translation import ugettext_lazy as _
 from django.views.generic import CreateView, ListView, UpdateView
 
@@ -52,7 +52,7 @@ class OrganizerCreate(CreateView):
 
     def dispatch(self, request, *args, **kwargs):
         if not request.user.is_superuser:
-            return HttpResponseForbidden()  # TODO
+            raise PermissionDenied()  # TODO
         return super().dispatch(request, *args, **kwargs)
 
     def form_valid(self, form):