CVS: Do not add empty CVS changes to the process list.
Fix for: Caught exception on exit
java.lang.NullPointerException
at com.perforce.common.process.ChangeInfo.<init>(ChangeInfo.java:37)
at com.perforce.cvs.process.CvsProcessChange.processChange(CvsProcessChange.java:94)
at com.perforce.common.process.ProcessChange.runSingle(ProcessChange.java:90)
at com.perforce.common.process.ProcessChange.call(ProcessChange.java:53)
at com.perforce.common.process.ProcessChange.call(ProcessChange.java:20)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caught EXIT shutting down ...