alanjds/drf-nested-routers — pull request #26 by ticosax (2014-09-09 14:17:08+00:00)
Title: Prevent AttributeError even if pk_url_kwarg is given.

```python
>>> self.pk_url_kwarg = kwargs.pop('pk_url_kwarg', self.pk_url_kwarg)
AttributeError: 'HyperlinkedIdentityField' object has no attribute 'pk_url_kwarg'
```