[BUG]: sortAxisCategoriesByValue conditional doesn't handle NaN values #7892

Description

The conditional check for sortAxisCategoriesByValue added in #7855 doesn't handle NaN values.

Steps to reproduce

• See this CI run

Notes

• I broke this when attempting to convert a confusing conditional check to a more explicit form
• This broke the test that was added in that PR, so good on the test ?