[issue43901] Add an empty annotations dict to all unannotated classes and modules

[Larry Hastings]

Larry Hastings <larry at hastings.org> added the comment:

> * Never modify o.__annotations__.

Let me revise that to:

* If o.__annotations__ is a dict, never modify the contents of that dict.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43901>
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