[issue11437] IDLE crash on startup with typo in config-keys.cfg

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

I reproduced the bug.

Roger Serwy, your patch looks working, but can you describe:
1. Why do you need `self.known_invalid` list?
2. Why do you always extend that list (`known_invalid` variable is 
just shared alias for `self.known_invalid` member, not list copy).

I'm a bit confusing with that logic.

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