[Checkins] [zopefoundation/Products.ZCatalog] cf950e: Fix clearing of special values of KexwordIndex

[Andreas Gabriel]

  Branch: refs/heads/notindexed_value_support
  Home:   https://github.com/zopefoundation/Products.ZCatalog
  Commit: cf950e6c3417c16a929c0665552019c7263a2e79
      https://github.com/zopefoundation/Products.ZCatalog/commit/cf950e6c3417c16a929c0665552019c7263a2e79
  Author: Andreas Gabriel <gabriel at hrz.uni-marburg.de>
  Date:   2019-05-26 (Sun, 26 May 2019)

  Changed paths:
    M src/Products/PluginIndexes/KeywordIndex/KeywordIndex.py
    M src/Products/PluginIndexes/KeywordIndex/tests.py

  Log Message:
  -----------
  Fix clearing of special values of KexwordIndex