[issue6804] IDLE: Detect Python files even if name doesn't end in .py

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

This makes sense, but the code should:
- not make the query when the extension is empty
- catch the WindowsError raised when the extension is not in the registry.

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nosy: +amaury.forgeotdarc

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