[Checkins] [zopefoundation/Products.ZCatalog] 0527e3: Fix TypeError

[GitHub]

  Branch: refs/heads/fix-type-error
  Home:   https://github.com/zopefoundation/Products.ZCatalog
  Commit: 0527e3e6bc0624c7f56a5e49efb87cd4bdf3e6b4
      https://github.com/zopefoundation/Products.ZCatalog/commit/0527e3e6bc0624c7f56a5e49efb87cd4bdf3e6b4
  Author: ale-rt <alessandro.pisa at gmail.com>
  Date:   2018-04-22 (Sun, 22 Apr 2018)

  Changed paths:
    M CHANGES.rst
    M src/Products/PluginIndexes/unindex.py

  Log Message:
  -----------
  Fix TypeError