Fix microsoft/vscode-pull-request-github#127. Close new comment widget when escape if it's empty

src/vs/workbench/parts/comments/electron-browser/commentThreadWidget.ts

@@ -354,9 +354,14 @@ export class ReviewZoneWidget extends ZoneWidget {
 
 		this._localToDispose.push(this._commentEditor.onKeyDown((ev: IKeyboardEvent) => {
 			const hasExistingComments = this._commentThread.comments.length > 0;
-			if (this._commentEditor.getModel().getValueLength() === 0 && ev.keyCode === KeyCode.Escape && hasExistingComments) {
-				if (dom.hasClass(this._commentForm, 'expand')) {
-					dom.removeClass(this._commentForm, 'expand');
+
+			if (this._commentEditor.getModel().getValueLength() === 0 && ev.keyCode === KeyCode.Escape) {
+				if (hasExistingComments) {
+					if (dom.hasClass(this._commentForm, 'expand')) {
+						dom.removeClass(this._commentForm, 'expand');
+					}
+				} else {
+					this.dispose();
 				}
 			}
 		}));