fixing the multi-instance page placeholder list bug #24
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The bug concerned all the lists on a multi-instance page which has had interactions before. In this case, when we dragged an item on a list in a way which caused an empty placeholder list being created on that list, a new empty placeholder list was created on every single list which has had interactions before (inside their last targetedNode) just because we did not reset the targetedNode after a drag finished.
@ptibbetts when you have a bit of time, please.