html5lib/html5lib-python — pull request #52 by ambv (2013-05-16 16:18:15+00:00)
Title: Use the default ElementTree implementation in getTreeWalker as well

The following fails without the patch:
```
>>> html5lib.getTreeWalker("etree")
Traceback (most recent call last):
...
AttributeError: 'NoneType' object has no attribute '__name__'
```