fix npe when reading payload of event

src/vs/workbench/parts/search/browser/searchViewlet.ts

@@ -410,7 +410,7 @@ export class SearchViewlet extends Viewlet {
 				}
 
 				let sideBySide = (originalEvent && (originalEvent.ctrlKey || originalEvent.metaKey));
-				let focusEditor = (keyboard && (<KeyboardEvent>originalEvent).keyCode === KeyCode.Enter) || doubleClick || event.payload.focusEditor;
+				let focusEditor = (keyboard && (<KeyboardEvent>originalEvent).keyCode === KeyCode.Enter) || doubleClick || (event.payload && event.payload.focusEditor);
 
 				if (element instanceof Match) {
 					let selectedMatch: Match = element;