- If the ``render_view_to_response`` function was called, if the

     view was found and called, but it returned something that did not
     implement IResponse, the error would pass by unflagged.  This was
     noticed when I created a view function that essentially returned
     None, but received a NotFound error rather than a ValueError when
     the view was rendered.  This was fixed.

1 files changed, 0 insertions, 4 deletions

diff --git a/repoze/bfg/router.py b/repoze/bfg/router.py
index febc7ad28..2850b14e3 100644
--- a/repoze/bfg/router.py
+++ b/repoze/bfg/router.py
@@ -60,10 +60,6 @@ class Router(object):
             app = HTTPNotFound(request.url)
             return app(environ, start_response)
 
-        if not is_response(response):
-            raise ValueError('response did not implement IResponse: %r'
-                             % response)
-
         dispatch(NewResponse(response))
 
         start_response(response.status, response.headerlist)