bpo-32779: Fix urljoining with an empty query string.

[thetorpedodog]

Previously, urllib.urljoin with a relative URL of the form '?' would result in no change to the URL, in spite of the fact that it should clear the query string. This solves that case and variations on it.

https://bugs.python.org/issue32779

[the-knights-who-say-ni]

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[thetorpedodog]

Bump—I’ve signed the CLA. How do I get that check rerun?

@the-knights-who-say-ni if i @ you will it do the thing

[thetorpedodog]

Removing reviewers who were added on account of a bad rebase. Sorry!

[terryjreedy]

Force pushing to do an update is almost never the right thing to do and too often ruins a PR by bringing in other commits. git merge upstream/main on the PR branch seems to never do this.

Removing the extraneous commits did not removed the reviewer requests, so I did the latter. With the PR back to your commits, I checked the box to run GHA tests so Senthil can see them.

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This PR is stale because it has been open for 30 days with no activity.

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