I forgot the 'default top redirection' feature.

see #197

admin/__init__.py

@@ -45,8 +45,8 @@ def enabled_applications():
         exts = list(Extension.objects.filter(enabled=True))
     except DatabaseError:
         exts = []
-    result += map(lambda ext: (ext.name, ext.name), exts)
-    return sorted(result)
+    result += [(ext.name, ext.name) for ext in exts]
+    return sorted(result, key=lambda e: e[0])
 
 parameters.register_admin("DEFAULT_TOP_REDIRECTION", type="list", deflt="admin",
                           app="general",

admin/models.py

@@ -808,8 +808,9 @@ class Extension(models.Model):
 
     def __init__(self, *args, **kwargs):
         super(Extension, self).__init__(*args, **kwargs)
-        self.instance = exts_pool.get_extension(self.name)
-        self.__get_ext_dir()
+        if self.name:
+            self.instance = exts_pool.get_extension(self.name)
+            self.__get_ext_dir()
 
     def __get_ext_dir(self):
         modname = self.instance.__module__