[TILES-V2-13] fix: support tiles v2 nullable cells

[pregnantboy]

TL;DR

This change addresses a compatibility issue between Tiles v1 and v2. In v1, empty cells were represented as empty strings or by omitting the key entirely, while in v2, empty cells return null values. This update ensures the application can properly handle data from both versions.

[pregnantboy]

• [TILES-V2-13] fix: support tiles v2 nullable cells #1120 👈 (View in Graphite)
• tiles-v2/trunk

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[kevinkim-ogp]

lgtm, tested and verified it works!

[datadog-opengovsg]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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