ActiveHistoryBrushSource deletes only if it exists. How?

If I use the first time or use again this script, I must reset history and delete activeHistoryBrushSource if there is one.
How can I reset (or delete) the activeHistoryBrushSource?
If it not exist or if it exist, it must not give me any error.
// here I need to delete activeHistoryBrushSource only if it exists
savedState = doc.activeHistoryState
doc.activeLayer.applyDustAndScratches(16,0); // only an example
doc.activeHistoryBrushSource = doc.activeHistoryState
doc.activeHistoryState = savedState

DustAndScratches was just an example.
I have made it already and I have just did it with listener:
It makes historybrush OFF from any history state.
Done
var desc6 = new ActionDescriptor();
var ref5 = new ActionReference();
ref5.putProperty( charIDToTypeID( "HstS" ), charIDToTypeID( "HstB" ));
desc6.putReference( charIDToTypeID( "null" ), ref5 );
executeAction( charIDToTypeID( "Cler" ), desc6, DialogModes.NO );

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ActiveHistoryBrushSource deletes only if it exists. How?

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