[JENKINS-62658] Multi-module Jenkins plugins fail mvn process-test-classes
#453
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See JENKINS-62658. Before this PR,
mvn -Dset.changelist process-test-classes
inpipeline-model-definition-plugin
at tag2.2123.va_31cb_3b_80ef8
failed. After this PR, it succeeds. There is no risk of regression here because this case previously threw an exception, so it can't get any worse than this. If you, the reader, feel there is some way this code could be improved, I would encourage you to file a pull request improving it.