reno==2.0.2 breaks puppet gates

[Alex Schultz]

2016-12-22 21:26:06.590020 | building [html]: all source files
2016-12-22 21:26:06.591133 | updating environment: 3 added, 0 changed, 0 removed
2016-12-22 21:26:06.591175 | reading sources... [ 33%] index
2016-12-22 21:26:06.649598 | reading sources... [ 66%] mitaka
2016-12-22 21:26:06.656516 | [reno.config] did not load config file /home/jenkins/workspace/gate-puppet-openstacklib-releasenotes/releasenotes/config.yaml: [Errno 2] No such file or directory: '/home/jenkins/workspace/gate-puppet-openstacklib-releasenotes/releasenotes/config.yaml'
2016-12-22 21:26:06.656700 | [reno] scanning /home/jenkins/workspace/gate-puppet-openstacklib-releasenotes/releasenotes/notes for origin/stable/mitaka release notes
2016-12-22 21:26:06.656916 | [reno.scanner] scanning /home/jenkins/workspace/gate-puppet-openstacklib-releasenotes/releasenotes/notes (branch=origin/stable/mitaka)
2016-12-22 21:26:06.748441 | [reno.scanner] There is no tag on commit 104f2d3e5836dd4c39e4b954cd93e4c86798fae4 at the base of origin/stable/mitaka. Branch scan short-cutting is disabled.
2016-12-22 21:26:06.748542 |
2016-12-22 21:26:06.748572 | Exception occurred:
2016-12-22 21:26:06.751615 | File "/home/jenkins/workspace/gate-puppet-openstacklib-releasenotes/.tox/releasenotes/local/lib/python2.7/site-packages/reno/scanner.py", line 35, in _parse_version
2016-12-22 21:26:06.751676 | parts = v.split('.') + ['0', '0', '0']
2016-12-22 21:26:06.751721 | AttributeError: 'NoneType' object has no attribute 'split'

http://logs.openstack.org/93/413593/1/gate/gate-puppet-openstacklib-releasenotes/6c5c30f/console.html#_2016-12-22_21_26_06_748572
http://logs.openstack.org/57/413757/4/gate/gate-puppet-neutron-releasenotes/2a3d058/console.html#_2016-12-22_21_31_27_028710

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/414356
Committed: https://git.openstack.org/cgit/openstack/reno/commit/?id=2f93c4dedea9edc1ffb4a96f6554469e235d75d7
Submitter: Jenkins
Branch: master

commit 2f93c4dedea9edc1ffb4a96f6554469e235d75d7
Author: Doug Hellmann <email address hidden>
Date: Thu Dec 22 19:29:15 2016 -0500

    centralize handling of branches without base tags

    Move the logic for handling an empty earliest_version value to the place
    where that value is used to find the scanning stop point so that all
    entries into that code path are protected from bad input data.

    Change-Id: Id54f8d48dd5dff6c6744c128a258d335a4586e6b
    Closes-Bug: #1652178
    Signed-off-by: Doug Hellmann <email address hidden>

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/reno 2.0.3 release.