fix npe with more tmp ugly code

src/vs/workbench/browser/parts/activitybar/activitybarPart.ts

@@ -181,9 +181,11 @@ export class ActivitybarPart extends Part implements IActivityService {
 			this.togglePanelAction.setBadge(null);
 		} else {
 			this.togglePanelAction.setBadge(this.panelActions[0].getBadge());
+			if (this.panelActions[0].getBadge()) {
 				this.panelActions[0].setBadge(null);
 			}
 		}
+	}
 
 	private toAction(composite: CompositeDescriptor<Viewlet | Panel>): ActivityAction {
 		const activeViewlet = this.viewletService.getActiveViewlet();