[Bug] [connector-file] When the data source field is less than the target (Hive) field，it will throw null pointer exception#8150

[linjianchang]

Purpose of this pull request

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.

[Hisoka-X]

Thanks @linjianchang ! Could you add an unit test?

[linjianchang]

Thanks @linjianchang ! Could you add an unit test?

Unit tests have been added, please review again, thank you

[Hisoka-X]

CI: https://github.com/linjianchang/seatunnel/actions/runs/12593993935/job/35100811128