[backport 4.0.x] Fix #12590: NPE on null rootDirectory in DefaultModelBuilder - #12903
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Add null checks for rootDirectory in getEnhancedProperties() to prevent NullPointerException when both session.getRootDirectory() throws and modelSource.getPath() returns null. Two locations are guarded: - rootDirectory.toString()/toUri() calls (lines 731-738): wrapped in null check so properties are simply omitted when root is unavailable - Objects.equals check before locateExistingPom (line 741): added rootDirectory != null guard to prevent passing null to POM locator Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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Backport of #12866 to maven-4.0.x.
Original PR: #12866