[Checkins] [zopefoundation/Zope] 6b081b: - set a default value to prevent errors

[Jens Vagelpohl]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Zope
  Commit: 6b081bfa1e61f5637534b90393f94d3a275cbcbd
      https://github.com/zopefoundation/Zope/commit/6b081bfa1e61f5637534b90393f94d3a275cbcbd
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2019-04-29 (Mon, 29 Apr 2019)

  Changed paths:
    M src/OFS/DTMLMethod.py

  Log Message:
  -----------
  - set a default value to prevent errors