Saving a Page Template with a content-type except text/html or text/xml raises an exception in Zope-2.12

[Kazuhiko]

Hello,

* create a Page Template
* modify Content-Type to something except 'text/html' or 'text/xml', i.e. 'application/xml' for example.
* then we get an exception

Traceback (innermost last):
  Module ZPublisher.Publish, line 127, in publish
  Module ZPublisher.mapply, line 77, in mapply
  Module ZPublisher.Publish, line 47, in call_object
  Module Products.PageTemplates.ZopePageTemplate, line 198, in pt_editAction
  Module Products.PageTemplates.ZopePageTemplate, line 163, in pt_edit
  Module Products.PageTemplates.utils, line 81, in convertToUnicode
TypeError: decoding Unicode is not supported

This is because Products.PageTemplates.utils.convertToUnicode try to call unicode(source) even if source is already unicode (not str).

I attach the patch for svn://svn.zope.org/repos/main/Zope/branches/2.12/src/Products/PageTemplates that tests and fixes this issue.

[Colin Watson (cjwatson)]

The zope2 project on Launchpad has been archived at the request of the Zope developers (see https://answers.launchpad.net/launchpad/+question/683589 and https://answers.launchpad.net/launchpad/+question/685285). If this bug is still relevant, please refile it at https://github.com/zopefoundation/zope2.