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NPE on first run (MacOS)

See original GitHub issue

MacOS 10.12.2 Rust 1.12.1 Cargo 0.13.0

null
java.lang.NullPointerException
	at org.rust.cargo.toolchain.impl.CargoMetadata.clean(CargoMetadata.kt:116)
	at org.rust.cargo.toolchain.Cargo.fullProjectDescription(Cargo.kt:52)
	at org.rust.cargo.project.workspace.impl.CargoProjectWorkspaceImpl$UpdateTask.run(CargoProjectWorkspaceImpl.kt:165)
	at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:710)
	at com.intellij.openapi.progress.impl.CoreProgressManager$3.run(CoreProgressManager.java:179)
	at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:568)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:519)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:164)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl$1.run(ProgressManagerImpl.java:128)
	at com.intellij.openapi.application.impl.ApplicationImpl$2.run(ApplicationImpl.java:309)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)