[Checkins] [zopefoundation/zope.index] 7f5dc0: handle None value in field index

[GitHub]

  Branch: refs/heads/none_value_field
  Home:   https://github.com/zopefoundation/zope.index
  Commit: 7f5dc0e037f9636211c011c9bf97b40458186845
      https://github.com/zopefoundation/zope.index/commit/7f5dc0e037f9636211c011c9bf97b40458186845
  Author: Forest Gregg <fgregg at uchicago.edu>
  Date:   2017-04-21 (Fri, 21 Apr 2017)

  Changed paths:
    M src/zope/index/field/index.py

  Log Message:
  -----------
  handle None value in field index