fix: resolve issue where model failed to start on TCE due to missing environment variables (#2403)

backend/bizpkg/config/modelmgr/builtin_conf.go

@@ -47,6 +47,11 @@ func getOldKnowledgeBuiltinChatModelConfig() *Model {
 	}
 
 	typeStr := strings.ToUpper(os.Getenv("BUILTIN_CM_TYPE"))
+
+	if typeStr == "" {
+		return nil
+	}
+
 	baseURLKey := fmt.Sprintf("BUILTIN_CM_%s_BASE_URL", typeStr)
 	apiKeyKey := fmt.Sprintf("BUILTIN_CM_%s_API_KEY", typeStr)
 	modelKey := fmt.Sprintf("BUILTIN_CM_%s_MODEL", typeStr)

backend/bizpkg/config/modelmgr/deprecate_model_get.go

@@ -63,7 +63,9 @@ func initOldModelConf(ctx context.Context, oss storage.Storage, c *ModelConfig)
 		return err
 	}
 
-	oldModels = append(oldModels, envModel)
+	if envModel != nil {
+		oldModels = append(oldModels, envModel)
+	}
 
 	for _, q := range oldModels {
 		if q.Provider.IconURI != "" {
@@ -106,6 +108,9 @@ func initOldModelConf(ctx context.Context, oss storage.Storage, c *ModelConfig)
 }
 
 func initModelByEnv() (*Model, error) {
+	if os.Getenv("MODEL_PROTOCOL_0") == "" || os.Getenv("MODEL_OPENCOZE_ID_0") == "" {
+		return nil, nil
+	}
 	protocol := os.Getenv("MODEL_PROTOCOL_0")
 	openCozeID, err := envkey.GetI64("MODEL_OPENCOZE_ID_0")
 	if err != nil {

backend/bizpkg/llm/modelbuilder/builtin.go

@@ -73,7 +73,7 @@ func GetBuiltinChatModel(ctx context.Context, envPrefix string) (bcm BaseChatMod
 
 	}
 
-	return nil, true, nil
+	return nil, false, nil
 }
 
 func checkModelConfig(ctx context.Context, bcm BaseChatModel) (err error) {