[issue33053] Avoid adding an empty directory to sys.path when running a module with `-m`

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Initial fix has been merged to master, CI runs pending for the backport to 3.7 and a follow-up master branch PR to remove a debugging print I noticed when resolving a test_import conflict in the backport.

I won't get to merging those until some time after work tomorrow (probably 8 pm'ish in UTC+10), so if anyone wanted to merge them before that, it would likely be a good idea :)

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<https://bugs.python.org/issue33053>
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