Thank you, Nick,
I think you are absolutely right, that the problem was prior to the code
cited in the traceback:
I had done the migration as "emergency user", which is not the best idea as
I read in http://plone.org/documentation/migration/2.1/index_html. I tried
the same thing as "manager" and everything works fine.
To prevent other people from making the same mistake, I suggest to leave a
note in portal_migration/manage_migrate that advices against doing the
migration as emergency user.
Thank you, guys, you are doing a great work.
Johannes
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