linqichen178

[core] fix Bug-NullPointException when readHadoopXml, for issue#6282 #6302

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Purpose fix bug: NullPointException when readHadoopXml Linked issue: (https://github.com/apache/paimon/issues/6282) Tests API and Format not involve Documentation not involve

[Bug] NullPointException when readHadoopXml

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### Search before asking - [x] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar. ### Paimon version paimon 1.1 spark 3.2 ### Compute Engine Spark 、 Hive ### Minimal...