recallDroppables function catch error when no item is being dragged

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When I rearrange items on the page, I'd like to just call $.recallDroppables. However, line 97 in idrop.js assumes that an item is being dragged, which causes an error to be thrown if not so. I'd appreciate this on line 93:

if (!jquery.iDrag.dragged) {return false;}

If not, can I count on this property myself? It feels like it should be private.