ipython/ipython — pull request #941 by cboos (2011-10-29 08:54:30+00:00)
Title: Follow-up to 387dcd6a, `_rl.__doc__` is `None` with pyreadline

Hello, I wanted to test master on Windows, but then got:

```
...
File "IPython\core\interactiveshell.py", line 1717, in init_readline
import IPython.utils.rlineimpl as readline
File "IPython\utils\rlineimpl.py", line 89, in
uses_libedit = 'libedit' in _rl.__doc__
TypeError: argument of type 'NoneType' is not iterable
```

This is with pyreadline 1.7 installed.