Don't update the action locality for actions with a null owner

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PiperOrigin-RevId: 149418372
MOS_MIGRATED_REVID=149418372
diff --git a/src/test/java/com/google/devtools/build/lib/runtime/ExperimentalStateTrackerTest.java b/src/test/java/com/google/devtools/build/lib/runtime/ExperimentalStateTrackerTest.java
index 954710e..5954f43 100644
--- a/src/test/java/com/google/devtools/build/lib/runtime/ExperimentalStateTrackerTest.java
+++ b/src/test/java/com/google/devtools/build/lib/runtime/ExperimentalStateTrackerTest.java
@@ -425,6 +425,7 @@
     Path path = outputBase.getRelative(new PathFragment(primaryOutput));
     Artifact artifact = new Artifact(path, Root.asSourceRoot(path));
     ActionExecutionMetadata actionMetadata = Mockito.mock(ActionExecutionMetadata.class);
+    when(actionMetadata.getOwner()).thenReturn(Mockito.mock(ActionOwner.class));
     when(actionMetadata.getPrimaryOutput()).thenReturn(artifact);
 
     ExperimentalStateTracker stateTracker = new ExperimentalStateTracker(clock);