Drag & Drop Interaction ignoring Null or Hidden Items

Hi All

I am currently building a course which uses the drag and drop interaction to create a game. At the start of the game user get an amount of chips to use. After each round if the user makes mistakes they lose some of the chips to place on in that round. Does anyone know if there is anyway in articulate storyline 2  there is any way to use drag and drop feature which would ignore null or hidden items?

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