Change a poll type URL manually crashes

[Diogo Matsubara]

Steps to reproduce (using sample data):
1.http://launchpad.dev/~ubuntu-team/+poll/never-closes3/+vote-condorcet
2. Manually change the URL to: http://launchpad.dev/~ubuntu-team/+poll/never-closes3/+vote-simple
3. Crash

    * Module zope.app.traversing.adapters, line 61, in traverse
      raise TraversalError(subject, name)
      __traceback_info__: (<zope.app.pagetemplate.simpleviewclass.SimpleViewClass from /home/matsubara/devel/launchpad/oops-bugs/lib/canonical/launchpad/templates/poll-vote-simple.pt object at 0x43a9602c>, 'currentVote', ['option'])

TraversalError: (<zope.app.pagetemplate.simpleviewclass.SimpleViewClass from /home/matsubara/devel/launchpad/oops-bugs/lib/canonical/launchpad/templates/poll-vote-simple.pt object at 0x43a9602c>, 'currentVote')

[Guilherme Salgado (salgado)]

We only have condorcet polls in our sampledata and it's not possible for users to create new condorcet polls, which means the +vote-condorcet page is not advertised anywhere.

[Curtis Hovey (sinzui)]

Looks like the view needs to be split (condorcet subclasses the simple one) so that it can check that the poll type is the one expects.
and show an error if something goes wrong. The zcml is easy to split into multiple views.

[Launchpad QA Bot (lpqabot)]

Fixed in stable r11698 <http://bazaar.launchpad.net/~launchpad-pqm/launchpad/stable/revision/11698>.