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Here's a patch that fixes the reported bug (calling close twice fails with an AttributeError) the simple way.
Note that there was actually a test for the buggy behavior, which is rather odd considering that there is also a 'closed' method that would fail similarly if close was ever called. (The only use for the existing 'closed' method that I can see is to see if somebody else closed the file out from under the ProxyFile, a 'feature' that seems of dubious utility.)
It seems clear to me that calling close more than once should be legal, so I fixed the test. closed will still report if the underlying file has been closed out from under ProxyFile.
Steffen, I still don't understand what you are trying to achieve with your patches. I plan to close this issue by applying my patch.