yesamer opened a new pull request, #6739:
URL: https://github.com/apache/incubator-kie-drools/pull/6739

   Closes: https://github.com/apache/incubator-kie-issues/issues/2334
   
   # NPE in AbstractTDefinitions.getDecisionService()
   
   ## Summary
   `getDecisionService()` throws NPE when `drgElement` is null. A DMN 
Definitions can legitimately have no DRG elements.
   
   ## Location
   
`kie-dmn/kie-dmn-model/src/main/java/org/kie/dmn/model/impl/AbstractTDefinitions.java:152`
   
   ## Problem
   ```java
   return drgElement.stream()... // NPE if drgElement is null
   ```
   
   ## Fix
   ```java
   return getDrgElement().stream()... // Uses null-safe getter
   ```
   
   Added test for entire AbstractTDefinitions class.


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