Following your fix to JENKINS-21094 I now get another exception:

[xUnit] [INFO] - Starting to record.
ERROR: Publisher org.jenkinsci.plugins.xunit.XUnitPublisher aborted due to exception
java.lang.NullPointerException
at org.jenkinsci.plugins.xunit.XUnitProcessor.performTests(XUnitProcessor.java:102)
at org.jenkinsci.plugins.xunit.XUnitProcessor.performXUnit(XUnitProcessor.java:54)
at org.jenkinsci.plugins.xunit.XUnitPublisher.perform(XUnitPublisher.java:88)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:785)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:757)
at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.post2(MavenModuleSetBuild.java:1030)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:706)
at hudson.model.Run.execute(Run.java:1703)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:519)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:231)
Finished: FAILURE