Pylons/pyramid — pull request #347 by RichardBarrell (2011-11-09 00:45:49+00:00)
Title: Issue330

Fix for issue #330, wherein you get a confusing exception from HTTPFound.prepare() when you call HTTPFound(location=None).prepare(environ), instead of a clear exception from HTTPFound.__init__()

https://github.com/Pylons/pyramid/issues/330