Added missing import.

misago/conf.py

@@ -51,6 +51,7 @@ class MisagoSettings(object):
         return self.setting(key)
 
     def __setitem__(self, key, value):
+        from misago.models import Setting
         setting = Setting.objects.get(pk=key)
         setting.value = value
         setting.save(force_update=True)
@@ -63,4 +64,4 @@ def SafeSettings():
     """
     Safe settings factory for MisagoSettings
     """
-    return MisagoSettings(_thread_local, False)
+    return MisagoSettings(_thread_local, False)