Fix trainingService initialize error in View mode (#3872)

ts/nni_manager/core/nnimanager.ts

@@ -204,11 +204,6 @@ class NNIManager implements Manager {
         const experimentId: string = getExperimentId();
         this.log.info(`Resuming experiment: ${experimentId}`);
         this.experimentProfile = await this.dataStore.getExperimentProfile(experimentId);
-        this.readonly = readonly;
-        if (readonly) {
-            this.setStatus('VIEWED');
-            return Promise.resolve();
-        }
 
         const config: ExperimentConfig = this.experimentProfile.params;
         this.config = config;
@@ -217,6 +212,12 @@ class NNIManager implements Manager {
             this.trainingService = await this.initTrainingService(config);
         }
 
+        this.readonly = readonly;
+        if (readonly) {
+            this.setStatus('VIEWED');
+            return;
+        }
+
         this.log.info('Setup tuner...');
         const dispatcherCommand: string = getMsgDispatcherCommand(config);
         this.log.debug(`dispatcher command: ${dispatcherCommand}`);