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java.lang.ArrayIndexOutOfBoundsException: 0	at org.pentaho.di.trans.steps.ifnull.IfNullMeta.clone(IfNullMeta.java:148)	at org.pentaho.di.trans.step.StepMeta.replaceMeta(StepMeta.java:466)	at org.pentaho.di.trans.step.StepMeta.clone(StepMeta.java:454)	at org.pentaho.di.ui.spoon.delegates.SpoonStepsDelegate.editStep(SpoonStepsDelegate.java:167)	at org.pentaho.di.ui.spoon.Spoon.editStep(Spoon.java:7710)	at org.pentaho.di.ui.spoon.trans.TransGraph.editStep(TransGraph.java:2755)	at org.pentaho.di.ui.spoon.trans.TransGraph.mouseDoubleClick(TransGraph.java:697)	at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)	at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)	at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)	at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1148)	at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:6922)	at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:548)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.pentaho.commons.launcher.Launcher.main(Launcher.java:134)