Fix #31780 - may blink the results for an instant before they are hidden,...

Fix #31780 - may blink the results for an instant before they are hidden, especially on slow machines, but will reduce confusion that often comes up

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

@@ -1154,6 +1154,7 @@ export class SearchViewlet extends Viewlet {
 				isDone = true;
 				progressRunner.done();
 				this.searchWidget.searchInput.showMessage({ content: e.message, type: MessageType.ERROR });
+				this.viewModel.searchResult.clear();
 			}
 		};