[twill] Get the error from a 500 page

[Titus Brown]

On Tue, Oct 23, 2007 at 04:23:36PM -0700, Samuel Newman wrote:
-> The problem is that the html is empty - I can get the browser, I can
-> get the title & URL, but I cannot get the body. I think this is
-> because mecahnize is bombing on the 500, so the result  doesn't get
-> the HTML body, just the headers.

p.s. To try for yourself, run the file 'tests/twilltestserver.py' and
use twill to go to 

	http://localhost:8080/exception

with this script:

go http://localhost:8080/exception
code 500
show

cheers,
--titus