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The _empty singleton has no-op subscribe/unsubscribe methods.

Turns out they can be called in some very strange error cases. See #162 and #163 for details.

This should fix #162 (at least the provided test case, five.intid, passes now).

It also does enough work on #163 that (a) the test can be written and run in pure-python mode, which was needed to debug it and (b) five.intid runs in pure-python mode (well, with a bunch of other small hacks to Acquisition, ExtensionClass, DocumentTemplate and AccessControl), but I won't claim that it fully fixes #163. For one thing, there are no specific tests. For another, I see more such differences.

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