Checking if extrema are all None in PhasePlot; fixes #3431

[chummels]

PR Summary

Attempts to fix Issue #3431 by checking if extrema values are all None when using a PhasePlot, and if so, treats as though extrema itself is None. See description in #3431 notes for more details.

[chummels]

I don't understand why the test was canceled?

[neutrinoceros]

Me neither, let's rerun it in hope it was due to a temporary failure from the environment.

[chummels]

Thanks, @neutrinoceros, for the simplified logic. I wasn't aware of that function, but it's useful.

[neutrinoceros]

I wasn't either ! I usually check more_itertools' doc only when I find myself or others writing this kind of custom logic :)

[neutrinoceros]

I report that this patch doesn't fix the other error raised from your test that I see on my machine. Can you please add it as an actual test here ?

[chummels]

I added a test, which fails on previous builds but works with this one. I think this should be ready to go assuming the tests pass. Thanks for the help, team.

[neutrinoceros]

So as discussed in the issue thread, this other error was my mistake. I confirm that this fixes the bug addressed, and that the test works as intended (red on main, green with this patch).
I found one small issue with how you implemented your test, but otherwise LGTM

[chummels]

Oh, I was worried about the temp file, which is why I implemented this within the superclass of TestBadProfiles (see here), which has a tearDown function which removes any saved files/directories, etc. I can include your change as well if you prefer, but I think it may be unnecessary.

[neutrinoceros]

Sorry I completely missed that. In this case I approve of this going in as is ! Thank you !

[matthewturk]

@meeseeksdev backport to yt-4.0.x