Fix text input suggestions when array is empty.

src/js/components/TextInput.js

@@ -125,7 +125,7 @@ export default class TextInput extends Component {
   _onInputChange (event) {
     const { onDOMChange, suggestions } = this.props;
 
-    if (suggestions && suggestions.length) {
+    if (suggestions && Array.isArray(suggestions)) {
       this.setState({
         activeSuggestionIndex: -1, announceChange: true, dropActive: true
       });