NullPointerException when using Snowflake Catalog as source and Delta Lake as target

[sfc-gh-mbaron]

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Please describe the bug 🐞

I've followed the steps within this blog to generate Delta Lake metadata from a Snowflake managed Iceberg table but run into the following NullPointerException:
java.lang.NullPointerException: null
at org.apache.xtable.iceberg.IcebergColumnStatsConverter.lambda$fromIceberg$2(IcebergColumnStatsConverter.java:106) ~[xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[?:?]
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) ~[?:?]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655) ~[?:?]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[?:?]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[?:?]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[?:?]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) ~[?:?]
at org.apache.xtable.iceberg.IcebergColumnStatsConverter.fromIceberg(IcebergColumnStatsConverter.java:119) ~[xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]
at org.apache.xtable.iceberg.IcebergDataFileExtractor.fromIceberg(IcebergDataFileExtractor.java:64) ~[xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]
at org.apache.xtable.iceberg.IcebergDataFileExtractor.fromIceberg(IcebergDataFileExtractor.java:53) ~[xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]
at org.apache.xtable.iceberg.IcebergConversionSource.fromIceberg(IcebergConversionSource.java:175) ~[xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]
at org.apache.xtable.iceberg.IcebergConversionSource.getCurrentSnapshot(IcebergConversionSource.java:156) ~[xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]
at org.apache.xtable.spi.extractor.ExtractFromSource.extractSnapshot(ExtractFromSource.java:38) ~[xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]
at org.apache.xtable.conversion.ConversionController.syncSnapshot(ConversionController.java:282) ~[xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]
at org.apache.xtable.conversion.ConversionController.syncTableFormats(ConversionController.java:202) ~[xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]
at org.apache.xtable.conversion.ConversionController.sync(ConversionController.java:105) ~[xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]
at org.apache.xtable.utilities.RunSync.main(RunSync.java:191) [xtable-utilities_2.12-0.2.0-SNAPSHOT-bundled.jar:0.2.0-SNAPSHOT]

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