fix: allow templating of null and undefined in a jest each key path template

[Germandrummer92]

Summary

See newly added e2e tests, currently jest crashed with:

 ● allows templating "$array.length"

    Cannot convert undefined or null to object

       7 | });

when adding a nested keypath as a template in a null or undefined object. Instead we just early-exit out of interplation in those cases.

Test plan

• yarn test yarn constraints

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Germandrummer92 / name: Daniel Draper (87febe7, 6ae80f6, 8f6e0a0, c67c4bf)
• ✅ login: SimenB / name: Simen Bekkhus (421d9a8)

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[Germandrummer92]

hmm, not sure why the tests are now failing 😢

[SimenB]

The one failing test is a known one

[SimenB]

thanks! just a minor change needed to actually run the test

[SimenB]

thanks!

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[SimenB]

https://github.com/jestjs/jest/releases/tag/v30.0.0-alpha.4