[Bug] `DataFrame.readJson()` reads `null` as empty list in array column
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bug
- Dominant language
- Kotlin
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Description
```kt
DataFrame.readJsonStr("""[null, [123], []]""")
```
produces
```kt
array
List
----
0 [ ]
1 [123]
2 [ ]
```
Expected:
```kt
array
List?
----
0 null
1 [123]
2 [ ]
```
Fixes https://github.com/Kotlin/dataframe/issues/2046
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