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bpo-36405: IDLE - Restore __main__ and add tests (#12518)

Fix error in commit 2b75155 noticed by Serhiy Storchaka.
T
Terry Jan Reedy committed
0fe4513d9a5510ae91c0da7eb0433f79a6d4dda9
Parent: 6661c17
Committed by GitHub <noreply@github.com> on 3/24/2019, 9:12:28 PM