[Checkins] [zopefoundation/Zope] 21a414: Improve on issue 717

[Dieter Maurer]

  Branch: refs/heads/issue717_4.x
  Home:   https://github.com/zopefoundation/Zope
  Commit: 21a414829b500f9d24f4e9ffa7309d1cf849ad8a
      https://github.com/zopefoundation/Zope/commit/21a414829b500f9d24f4e9ffa7309d1cf849ad8a
  Author: dieter <dieter at handshake.de>
  Date:   2020-03-14 (Sat, 14 Mar 2020)

  Changed paths:
    M CHANGES.rst
    M src/Products/Five/browser/pagetemplatefile.py
    M src/Products/PageTemplates/Expressions.py
    M src/Products/PageTemplates/PageTemplate.py
    M src/Products/PageTemplates/engine.py
    M src/Products/PageTemplates/expression.py

  Log Message:
  -----------
  Improve on issue 717