Fix null in structured types arrays regression

[sfc-gh-astachowski]

Description

Undone some refactoring that caused a regression

Checklist

• [ ] Created tests which fail without the change (if possible)
• [ ] Extended the README / documentation, if necessary

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.55%. Comparing base (2e40d2e) to head (e229316). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1187 +/- ## ========================================== + Coverage 82.54% 82.55% +0.01% ========================================== Files 54 54 Lines 12815 12823 +8 ========================================== + Hits 10578 10586 +8 Misses 2237 2237 ```

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