[Backport 3.3] Handle NPE of no agents system index found

public/pages/workflow_detail/agentic_search/configure_flow/agent_configuration.tsx

@@ -106,7 +106,7 @@ export function AgentConfiguration(props: AgentConfigurationProps) {
   // listen to agent ID changes. update the agent config form values appropriately
   useEffect(() => {
     const selectedAgentIdForm = getIn(values, AGENT_ID_PATH, '') as string;
-    const agent = agents[selectedAgentIdForm];
+    const agent = getIn(agents, selectedAgentIdForm, {});
     if (!isEmpty(selectedAgentIdForm) && !isEmpty(agent)) {
       props.setAgentForm(agent);
     } else if (selectedAgentIdForm === NEW_AGENT_PLACEHOLDER) {

public/pages/workflow_detail/agentic_search/test_flow/test_flow.tsx

@@ -61,7 +61,7 @@ export function TestFlow(props: TestFlowProps) {
   const selectedAgentId = getIn(values, AGENT_ID_PATH, '') as string;
   const [agent, setAgent] = useState<Partial<Agent>>({});
   useEffect(() => {
-    const agentRedux = agents[selectedAgentId];
+    const agentRedux = getIn(agents, selectedAgentId, {});
     if (!isEmpty(selectedAgentId) && !isEmpty(agentRedux)) {
       setAgent(agentRedux);
     }

server/routes/ml_routes_service.ts

@@ -21,11 +21,15 @@ import {
   GET_AGENT_NODE_API_PATH,
   UPDATE_AGENT_NODE_API_PATH,
   Agent,
+  AgentDict,
+  ModelDict,
+  ConnectorDict,
 } from '../../common';
 import {
   generateCustomError,
   getConnectorsFromResponses,
   getModelsFromResponses,
+  isIgnorableError,
 } from './helpers';
 import { getClientBasedOnDataSource } from '../utils/helpers';
 
@@ -212,6 +216,9 @@ export class MLRoutesService {
 
       return res.ok({ body: { models: modelDict } });
     } catch (err: any) {
+      if (isIgnorableError(err)) {
+        return res.ok({ body: { models: {} as ModelDict } });
+      }
       return generateCustomError(res, err);
     }
   };
@@ -243,6 +250,9 @@ export class MLRoutesService {
 
       return res.ok({ body: { connectors: connectorDict } });
     } catch (err: any) {
+      if (isIgnorableError(err)) {
+        return res.ok({ body: { connectors: {} as ConnectorDict } });
+      }
       return generateCustomError(res, err);
     }
   };
@@ -317,6 +327,9 @@ export class MLRoutesService {
 
       return res.ok({ body: { agents } });
     } catch (err: any) {
+      if (isIgnorableError(err)) {
+        return res.ok({ body: { agents: {} as AgentDict } });
+      }
       return generateCustomError(res, err);
     }
   };