It is definitely in Action Chains. Whether it is triggered or not by the chain you imported I can't say.
FYI: in the library_about_to_change event the old database can be None, which it probably is when check library is used because there isn't a previous database. That is why you are getting the exception. You should be able to avoid it by disabling any actions that depend on that event.
You should post this in the Action Chains thread. EDIT: I will move it there.
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