Try to restore broken blobs when exporting content. #230
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This is a fix I came up when exporting content where for some unknown reason some quite old Blobs from a project from 2013 were in a broken state.
I got a warning
WARNING OFS.Uninstalled Could not import class 'NamedBlobFile' from module 'zope.app.file.file'which is related to the broken blobs but I cannot recall via git searches why I'd have used zope.app.file once.However, this PR fixes my problem. I'm OK if this won't get merged and live in a local branch instead.