content rules, changes get lost after zope restart

[mr_savage]

Changes done to content rules conditions and actions get lost when restarting the zope instance. This happens from plone 3.0.5 on.

Tested with action Move to Folder and condition Content Type

steps to reprocedure:

on a standard plone 3.0.5 or plone 3.0.6 site create a content rule condition: Content Type (initial specify page e.g.)

change the condition to another content type ( event e.g.)

restart the zope instance, the condition's content type will be page again

[optilude]

(In [19725]) Be a lot less clever. Fixes #7909.

[optilude]

(In [19726]) Backport fix refs #7909.