Fix NPE when user agent source field is missing #6374
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…issing Signed-off-by: Aman Gautam <amangautam2128@gmail.com>
Gautam-aman
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KarstenSchnitter,
chenqi0805,
dinujoh,
dlvenable,
engechas,
graytaylor0,
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san81,
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srikanthjg
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Problem
UserAgentProcessor throws a NullPointerException when the configured source field is missing from the event.
Solution
Replaced the implicit NullPointerException with an explicit exception that is handled by existing error logic. This prevents unexpected NPEs while preserving current failure tagging behavior.
Tests
Fixes #6010