Jenkins build fails with:

```
>> Job status: [JOB_NAME] subjob last build result is worse than unstable.
Triggering JOB_NAME. Condition was evaluated to true.
Starting build job JOB_NAME.
ERROR: Build step failed with exception
java.lang.NullPointerException
at com.tikal.jenkins.plugins.multijob.MultiJobBuilder.getScmChange(MultiJobBuilder.java:178)
at com.tikal.jenkins.plugins.multijob.MultiJobBuilder.perform(MultiJobBuilder.java:269)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)
at hudson.model.Build$BuildExecution.build(Build.java:205)
at hudson.model.Build$BuildExecution.doRun(Build.java:162)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534)
at com.tikal.jenkins.plugins.multijob.MultiJobBuild$MultiJobRunnerImpl.run(MultiJobBuild.java:136)
at hudson.model.Run.execute(Run.java:1729)
at com.tikal.jenkins.plugins.multijob.MultiJobBuild.run(MultiJobBuild.java:73)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:404)
```

which seems to be this line:
```
if ( !lastBuild.getWorkspace().exists() ) {
```

Have no idea what's changed.. It used to work.
Probably new nodes which lack workspaces for the JOB_NAME were added