Javatest 4.2_b13.

- Start the Harness. Open WD.
- Select and run testA in normal circumstances to get passed (or failed/error) result.
- Modify testsuite code in such a way that it will generate NOT_RUN result next time for testA.
- run test session. You'll see NPE exception in console and test session will never be stopped.

java.lang.NullPointerException
        at com.sun.javatest.exec.TestTreePanel$PanelModel.finishedTest(TestTreePanel.java:1896)
        at com.sun.javatest.Harness$Notifier.finishedTest(Harness.java:906)
        at com.sun.javatest.TestRunner.notifyFinishedTest(TestRunner.java:227)
...

This is a regression compared to jt4.1.4