It seems that the Launcher argument in SCM.pollChanges() is null, which makes it
impossible to poll as the TFS server polls through command line.

I have a test project that is setup with TFS, and to be built on a node; and it
will throw the below exception in the console when it is trying to poll.

I have tested 1.321, 1.322-SNAPSHOT (28 aug 9:00 GMT) and both of them has this
problem. If I revert to Hudson 1.317, then the issue does not occur UNLESS the
node isnt started.

But for 1.318+, even if the node is started and had successful builds on it, I
still get launcher=null in the poll method.

-----------------------------------------------------------
INFO: Starting poll project=hudson.model.FreeStyleProject@183eae7[Polling 321],
launcher=null, workspace=null, listener=
hudson.util.StreamTaskListener@1a7a05
2009-aug-28 10:21:11 hudson.triggers.SCMTrigger$Runner runPolling
ALLVARLIG: Failed to record SCM polling
java.lang.NullPointerException
at hudson.plugins.tfs.TfTool.execute(TfTool.java:99)
at hudson.plugins.tfs.model.Server.execute(Server.java:47)
at hudson.plugins.tfs.model.Project.getDetailedHistory(Project.java:41)
at
hudson.plugins.tfs.TeamFoundationServerScm.pollChanges(TeamFoundationServerScm.j
ava:188)
at hudson.model.AbstractProject.pollSCMChanges(AbstractProject.java:975)
at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:312)
at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:339)
at
hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.jav
a:114)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:8
85)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
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