bpo-28859: Fix return value of ismount on Windows#19109

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digglife wants to merge 4 commits into

python:mainfrom

digglife:issue28859

Commits on Mar 22, 2020

Commits on Mar 24, 2020

use exception approach
digglife
committed

Commits on Mar 31, 2020

Test explicitly when path is under a missing drive.
digglife
committed