None should be a subtype of an empty protocol

Currently this gives an incompatible type error with --strict-optional, although it works with plain object:

class Empty(Protocol):
    pass

e: Empty
e = None  # Error

o: object
o = None # This is OK

Should we have a topic-protocols label?

Yes. Do you want to add one?

Created the label and added some issues. Ivan may want to double-check, there may be more issues to be categorized this way.

Thanks! I added the label to few other issues.

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