Avoid warning due to bounding box calculation in Universe.plot

[paulromano]

Description

Some of you may have noticed that running universe.plot() produces a warning message about an invalid value (for an example, see the screenshot in #2648). This is due to a bounding box calculation where the bounding box has some infinity values in it (that result in a nan value in the center property). This PR simply silences the warning since the invalid values are being handled appropriately.

Checklist

• I have performed a self-review of my own code
• I have run clang-format on any C++ source files (if applicable)
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)

[shimwell]

This will be nice for people who get worried about that warning message.

I notice the docstring for Origin includes "Defaults to (0, 0, 0) if the bounding_box contains inf values" but perhaps this should be changed to something like. "inf values in the bounding_box.center get replaced with 0"

[paulromano]

@shimwell Good suggestion -- I've just updated that.

[shimwell]

Thanks Paul, this review makes sense. I've run the warning raising code locally before and after the PR to check. All looks good to me, thanks for the additional doc string fix.

auto squash merged enabled ✔️