[Checkins] [zopefoundation/zope.index] dbb89b: handle None value in field index (#12)

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.index
  Commit: dbb89bacaae1e7a347a28f5b55846b853e68776d
      https://github.com/zopefoundation/zope.index/commit/dbb89bacaae1e7a347a28f5b55846b853e68776d
  Author: Forest Gregg <fgregg at users.noreply.github.com>
  Date:   2017-04-21 (Fri, 21 Apr 2017)

  Changed paths:
    M .travis.yml
    M CHANGES.rst
    M setup.py
    M src/zope/index/field/index.py
    M src/zope/index/field/tests.py

  Log Message:
  -----------
  handle None value in field index (#12)