Fix bad option check (microsoft#54435)

cleidigh · web-flow · commit ed25759e543f · 2018-07-16T22:27:31.000-04:00
diff --git a/src/vs/base/browser/ui/selectBox/selectBoxNative.ts b/src/vs/base/browser/ui/selectBox/selectBoxNative.ts
@@ -14,6 +14,7 @@ import { isMacintosh } from 'vs/base/common/platform';
 export class SelectBoxNative implements ISelectBoxDelegate {
 
 	private selectElement: HTMLSelectElement;
+	private selectBoxOptions: ISelectBoxOptions;
 	private options: string[];
 	private selected: number;
 	private readonly _onDidSelect: Emitter<ISelectData>;
@@ -23,12 +24,13 @@ export class SelectBoxNative implements ISelectBoxDelegate {
 	constructor(options: string[], selected: number, styles: ISelectBoxStyles, selectBoxOptions?: ISelectBoxOptions) {
 
 		this.toDispose = [];
+		this.selectBoxOptions = selectBoxOptions || Object.create(null);
 
 		this.selectElement = document.createElement('select');
 		this.selectElement.className = 'monaco-select-box';
 
-		if (typeof selectBoxOptions.ariaLabel === 'string') {
-			this.selectElement.setAttribute('aria-label', selectBoxOptions.ariaLabel);
+		if (typeof this.selectBoxOptions.ariaLabel === 'string') {
+			this.selectElement.setAttribute('aria-label', this.selectBoxOptions.ariaLabel);
 		}
 
 		this._onDidSelect = new Emitter<ISelectData>();
