Fix normalize type options

[pedrodurek]

I forgot to move this last change here, it's more like an improvement than a fix, so we can appropriately test the returnNull and returnEmptyString options.

Checklist

• only relevant code is changed (make a diff before you submit the PR)
• run tests npm run test
• tests are included
• commit message and code follows the Developer's Certification of Origin

Checklist (for documentation change)

• only relevant documentation part is changed (make a diff before you submit the PR)
• motivation/reason is provided
• commit message and code follows the Developer's Certification of Origin

[coveralls]

Coverage remained the same at 91.157% when pulling 901eaa8 on pedrodurek:fix-normalize-type-options into e599bd5 on i18next:master.

[adrai]

Do you want me to create a new patch release for this or is this not necessary?

[pedrodurek]

yeah, it's better to create a patch release, sorry @adrai ❤️

[adrai]

no problem, v22.0.1 has just been released