fix: Handle NaN values in sortAxisCategoriesByValue conditional check

[camdecoster]

Description

Update conditional check for sortAxisCategoriesByValue to handle NaN values.

Changes

• Update conditional check

Testing

• Run npm run test-jasmine calcdata locally
• Check CI

Notes

• This check was added in Fix crash when ordering categories by value with null coordinates #7855, but I broke it in the last commit