Fix bug in autosuggest text box causing review widget to crash #2573
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Introduced accidentally by me in #2517. Lodash's
_indexOf(arr, elem)returns -1 ifarris undefined, and the AutosuggestTextBox component depended on this behavior. This PR changes the logic to use optional chaining (to guard againstpreferredResultsbeing undefined) andArray.contains()(to remove the double negative and make intent clearer).