NPE in builder

[njbartlett]

1. Deleted cnf project (but not underlying files)
2. Reimported cnf project
3. Edit a bnd.bnd to trigger rebuild

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java.lang.NullPointerException
at org.eclipse.core.internal.events.BuildManager.needsBuild(BuildManager.java:872)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:153)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

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org.eclipse.core.runtime.CoreException: Build Error!
at bndtools.builder.NewBuilder.build(NewBuilder.java:129)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:627)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: java.lang.NullPointerException
at org.eclipse.core.internal.events.BuildManager.isInterestingProject(BuildManager.java:815)
at org.eclipse.core.internal.events.BuildManager.getDelta(BuildManager.java:558)
at org.eclipse.core.internal.events.InternalBuilder.getDelta(InternalBuilder.java:93)
at org.eclipse.core.resources.IncrementalProjectBuilder.getDelta(IncrementalProjectBuilder.java:234)
at bndtools.builder.NewBuilder.isCnfChanged(NewBuilder.java:179)
at bndtools.builder.NewBuilder.build(NewBuilder.java:77)
... 12 more

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