fix dropdown error where re-clicking into a dropdown caused an error #109
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Bug described in more detail: https://trello.com/c/dsXGOFpC/2064-bug-%F0%9F%90%9B-opening-and-closing-a-completed-comparison-filter-shows-an-error%F0%9F%94%B5%F0%9F%94%B5%F0%9F%94%B5%F0%9F%9F%A5