rzo1 opened a new pull request, #583:
URL: https://github.com/apache/opennlp/pull/583

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   ### For code changes:
   - [x] Have you ensured that the full suite of tests is executed via mvn 
clean install at the root opennlp folder?
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   - [ ] If adding new dependencies to the code, are these dependencies 
licensed in a way that is compatible for inclusion under [ASF 
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   ### For documentation related changes:
   - [ ] Have you ensured that format looks appropriate for the output in which 
it is rendered?
   
   ### Note:
   
   Eval Run: 
https://ci-builds.apache.org/job/OpenNLP/job/eval-tests-configurable/17/
   
   The current AD parser returns NULL tags in case they could not be parsed, 
for example: "=====P.vp" should be "=====P:vp" in the source data. 
   
   The code in `ChunkSample` with `List.copyOf(....)` doesn't allow NULL values 
anymore leading to the NPE issue in the eval tests. 
   
   This PR changes the related code to set an empty String instead of a NULL 
tag. I don't know, if `""`and `null` can be used as semantically equal here, 
but in any case it represents an unknown tag as a result from a failed parsing 
attempt. 
   
   Eval accuracy will change a bit. See Slack thread for more details: 
https://the-asf.slack.com/archives/C03869UDYJG/p1704288164823829
   
   


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