DynamodbAttributeValueTransformer causing break in functionality for empty list when transforming (v2)

I'm using DynamoDb Enhanced library version `2.15.82`. Recently, `aws-lambda-java-events-sdk-transformer` version `3.0.2` causes a break in the functionality when trying to transform empty list. Empty list is transformed to `null` which for DynamoDb Enhanced library expects an empty list, and causes DynamoDB Enhanced library to throw the below stack trace.

```
java.lang.IllegalStateException: Unable to convert attribute value: AttributeValue()
software.amazon.awssdk.enhanced.dynamodb.internal.converter.attribute.EnhancedAttributeValue.fromAttributeValue(EnhancedAttributeValue.java:352) ~[dynamodb-enhanced-2.15.82.jar:na]
software.amazon.awssdk.enhanced.dynamodb.internal.converter.attribute.ListAttributeConverter$Delegate.transformTo(ListAttributeConverter.java:154) ~[dynamodb-enhanced-2.15.82.jar:na]
software.amazon.awssdk.enhanced.dynamodb.internal.converter.attribute.ListAttributeConverter.transformTo(ListAttributeConverter.java:120) ~[dynamodb-enhanced-2.15.82.jar:na]
software.amazon.awssdk.enhanced.dynamodb.internal.converter.attribute.ListAttributeConverter.transformTo(ListAttributeConverter.java:82) ~[dynamodb-enhanced-2.15.82.jar:na]
software.amazon.awssdk.enhanced.dynamodb.internal.mapper.StaticAttributeType.attributeValueToObject(StaticAttributeType.java:44) ~[dynamodb-enhanced-2.15.82.jar:na]
software.amazon.awssdk.enhanced.dynamodb.internal.mapper.ResolvedImmutableAttribute.lambda$create$1(ResolvedImmutableAttribute.java:61) ~[dynamodb-enhanced-2.15.82.jar:na]
software.amazon.awssdk.enhanced.dynamodb.mapper.StaticImmutableTableSchema.mapToItem(StaticImmutableTableSchema.java:458) ~[dynamodb-enhanced-2.15.82.jar:na]
software.amazon.awssdk.enhanced.dynamodb.mapper.WrappedTableSchema.mapToItem(WrappedTableSchema.java:54) ~[dynamodb-enhanced-2.15.82.jar:na]
```

Further investigation points to the below code in `DynamodbAttributeValueTransformer` that's causing the issue
```
else if (Objects.nonNull(value.getL())) {
return AttributeValue.builder()
.l(value.getL().isEmpty()
? null
: value.getL().stream()
.map(DynamodbAttributeValueTransformer::toAttributeValueV2)
.collect(Collectors.toList()))
.build();

}
```

I noticed this change happens from `aws-lambda-java-events-sdk-transformer` version `2.0.8` to `3.0.0` on commit `3e71a17c57ba6c99734c4633a4f412fd2d5b6b42`

Any advice on this? Is there a reason for this code change that causes a break in functionality?

從 DynamodbAttributeValueTransformer 開始，比較 2.0.8 與 3.0.0 版本之間引入的空清單處理方式，尤其是 commit 3e71a17c57ba6c99734c4633a4f412fd2d5b6b42。使用 aws-lambda-java-events-sdk-transformer 3.0.2 和 DynamoDb Enhanced 2.15.82 重現該轉換；當空清單不再變成 null 或導致所示的轉換失敗時，即表示完成。

由索引模型根據 Issue 內容生成。