django-mptt/django-mptt — pull request #218 by smlz (2012-11-13 21:42:52+00:00)
Title: [0.5.x] Prevent self-triggering of DeprecationWarning

When registering `MPTTModel` classes with overlapping type hierarchies, the code that that attaches a `_WarningDescriptor` to the `"tree"` attribute, actually triggers the `DeprecationWarning` via calling `getattr`.

Fixes Issue #209