acl: set up warning on group/user not found

circle/dashboard/views.py

@@ -4,10 +4,12 @@ import logging
 import re
 import re
 
 
 from django.contrib.auth.models import User, Group
 from django.contrib.auth.models import User, Group
+from django.contrib.messages import warning
 from django.core import signing
 from django.core import signing
 from django.core.exceptions import PermissionDenied
 from django.core.exceptions import PermissionDenied
 from django.core.urlresolvers import reverse
 from django.core.urlresolvers import reverse
 from django.shortcuts import redirect
 from django.shortcuts import redirect
+from django.utils.translation import ugettext_lazy as _
 from django.views.generic import TemplateView, DetailView, View
 from django.views.generic import TemplateView, DetailView, View
 from django.views.generic.detail import SingleObjectMixin
 from django.views.generic.detail import SingleObjectMixin
 from django.http import HttpResponse
 from django.http import HttpResponse
@@ -102,8 +104,10 @@ class AclUpdateView(View, SingleObjectMixin):
                 entity = User.objects.get(username=name)
                 entity = User.objects.get(username=name)
             except User.DoesNotExist:
             except User.DoesNotExist:
                 entity = Group.objects.get(name=name)
                 entity = Group.objects.get(name=name)
-            instance.set_level(entity, value)
-        return redirect(instance)
+            except Group.DoesNotExist:
+                warning(request, _('User or group "%s" not found.') % name)
+                return
+
         logger.info("Set %s's new acl level for %s to %s by %s.",
         logger.info("Set %s's new acl level for %s to %s by %s.",
                     unicode(entity), unicode(instance),
                     unicode(entity), unicode(instance),
                     value, unicode(request.user))
                     value, unicode(request.user))