Issue #291: Cannot pull/clone after upgrade from 0.3.2 to 0.3.3 (conservancy/kallithea)

[Arun Chandrasekaran]

New issue 291: Cannot pull/clone after upgrade from 0.3.2 to 0.3.3
https://bitbucket.org/conservancy/kallithea/issues/291/cannot-pull-clone-after-upgrade-from-032

Arun Chandrasekaran:

```
#!text


2017-08-07 16:59:15.367 ERROR [kallithea.lib.middleware.simplehg] Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/kallithea/lib/middleware/simplehg.py", line 210, in _handle_request
    app = self.__make_app(repo_path, baseui, extras)
  File "/usr/lib/python2.6/site-packages/kallithea/lib/middleware/simplehg.py", line 243, in __make_app
    return HgWebWrapper(repo_name, name=repo_name, baseui=baseui)
  File "/usr/lib64/python2.6/site-packages/mercurial/hgweb/hgweb_mod.py", line 232, in __init__
    r = hg.repository(u, repo)
  File "/usr/lib64/python2.6/site-packages/mercurial/hg.py", line 166, in repository
    peer = _peerorrepo(ui, path, create)
  File "/usr/lib64/python2.6/site-packages/mercurial/hg.py", line 153, in _peerorrepo
    obj = _peerlookup(path).instance(ui, path, create)
  File "/usr/lib64/python2.6/site-packages/mercurial/hg.py", line 123, in _peerlookup
    return thing(path)
  File "/usr/lib/python2.6/site-packages/hgsubversion/__init__.py", line 188, in _lookup
    if util.islocalrepo(url):
AttributeError: 'NoneType' object has no attribute 'islocalrepo'

```