Skip UseMapOf when put() argument is a null literal#1094
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`Map.of(..)` throws `NullPointerException` on null keys or values, so converting a `HashMap` containing null arguments is not behavior-preserving. Fixes #1092
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Map.of(..)throwsNullPointerExceptionon null keys or values, so converting aHashMapcontaining null arguments is not behavior-preserving. Added a null-literal guard mirroring the one inMigrateCollectionsSingletonMap(PR feat: Prevent migration of singletonMap with null value or null key #772) plus tests for null key and null value cases.Fixes UseMapOf converts HashMap with null keys/values to Map.of() which throws NullPointerException #1092