Safegaurding alerts in case they come back undefined (#85108)

x-pack/plugins/monitoring/public/views/base_controller.js

@@ -168,7 +168,7 @@ export class MonitoringViewBaseController {
         $scope.$apply(() => {
           this._isDataInitialized = true; // render will replace loading screen with the react component
           $scope.pageData = this.data = pageData.value; // update the view's data with the fetch result
-          $scope.alerts = this.alerts = alerts.value || {};
+          $scope.alerts = this.alerts = alerts && alerts.value ? alerts.value : {};
         });
       });
     };