[Checkins] [zopefoundation/Products.ZCatalog] f351a1: proposed fix for #100, case where index value is c...

[wohnlice]

  Branch: refs/heads/fix_100
  Home:   https://github.com/zopefoundation/Products.ZCatalog
  Commit: f351a17c4febf39708ab8776ba7be2259e775233
      https://github.com/zopefoundation/Products.ZCatalog/commit/f351a17c4febf39708ab8776ba7be2259e775233
  Author: wohnlice <wohnlice at imsweb.com>
  Date:   2020-05-05 (Tue, 05 May 2020)

  Changed paths:
    A .idea/Products.ZCatalog.iml
    A .idea/misc.xml
    A .idea/modules.xml
    A .idea/vcs.xml
    A .idea/workspace.xml
    M CHANGES.rst
    M src/Products/PluginIndexes/FieldIndex/tests.py
    M src/Products/PluginIndexes/unindex.py

  Log Message:
  -----------
  proposed fix for #100, case where index value is changed to None after previously being indexed