Support unobtainable creation dates (= None) in BTs
getCreationDate tries to obtain the date from the following sources (in that order):
the workflow history
Noneif it can't find any
The objects on which
getCreationDate is called (in this case):
do not have a workflow history;
The date is actually obtained from the portal ("
portal.creation_date") by Acquisition.
Because of an incoming change related to CMF (we drop Products.CMFDefault)(see !957), this behavior will change and
None will be returned instead.
The changes were merged into master. The source branch has been removed.
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