fix: handle undefined object in cache correctly

[dlehmhus]

Motivation

Fixes: !144
This PR addresses an issue where the cache did not correctly handle cases when an object was undefined.

Summary

• Updated the cache implementation to properly handle cases where the cached object is undefined.
• Added a test in cache.test.ts to cover this scenario and ensure correct behavior.

Test plan

• Added a new test in packages/transform/src/tests/cache.test.ts to verify that the cache correctly handles undefined objects.
• Ran the test suite to confirm that all tests pass and the new case is covered.

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Latest commit: cd50bb5

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