Delete redundant code (#3526)

ts/nni_manager/training_service/kubernetes/frameworkcontroller/frameworkcontrollerTrainingService.ts

@@ -66,7 +66,6 @@ class FrameworkControllerTrainingService extends KubernetesTrainingService imple
             await this.fcJobInfoCollector.retrieveTrialStatus(this.kubernetesCRDClient);
             if (this.kubernetesJobRestServer.getErrorMessage !== undefined) {
                 throw new Error(this.kubernetesJobRestServer.getErrorMessage);
-                this.stopping = true;
             }
         }
     }

ts/nni_manager/training_service/kubernetes/kubeflow/kubeflowTrainingService.ts

@@ -60,7 +60,6 @@ class KubeflowTrainingService extends KubernetesTrainingService implements Kuber
             await this.kubeflowJobInfoCollector.retrieveTrialStatus(this.kubernetesCRDClient);
             if (this.kubernetesJobRestServer.getErrorMessage !== undefined) {
                 throw new Error(this.kubernetesJobRestServer.getErrorMessage);
-                this.stopping = true;
             }
         }
         this.log.info('Kubeflow training service exit.');