A URL such as this:
Raised a Python exception when it should have return a 404 error. The trick
to triggering this bug was to specify an extension that did not exist.
The solution was to add this in Application.serverSidePathForRequest():
elif not os.path.exists(ssPath):
raise AssertionError, "Unexpected if-else fall through."
I confirmed that version 0.4.1 shipped with this bug. Besides fixing the
bug, I added a couple test cases to the Testing/ context.