feat: handle application not found (#1913)

Signed-off-by: Gaius <gaius.qi@gmail.com>

manager/rpcserver/rpcserver.go

@@ -996,6 +996,10 @@ func (s *Server) ListApplications(ctx context.Context, req *managerv1.ListApplic
 	log.Debugf("%s cache miss", cacheKey)
 	var applications []model.Application
 	if err := s.db.WithContext(ctx).Find(&applications).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, status.Error(codes.NotFound, err.Error())
+		}
+
 		return nil, status.Error(codes.Unknown, err.Error())
 	}
 

scheduler/config/dynconfig.go

@@ -371,12 +371,22 @@ func (mc *managerClient) Get() (any, error) {
 		Ip:         mc.config.Server.AdvertiseIP,
 	})
 	if err != nil {
-		// TODO Compatible with old version manager.
-		if s, ok := status.FromError(err); ok && s.Code() == codes.Unimplemented {
-			return DynconfigData{
-				Scheduler:    getSchedulerResp,
-				Applications: nil,
-			}, nil
+		if s, ok := status.FromError(err); ok {
+			// TODO Compatible with old version manager.
+			if s.Code() == codes.Unimplemented {
+				return DynconfigData{
+					Scheduler:    getSchedulerResp,
+					Applications: nil,
+				}, nil
+			}
+
+			// Handle application not found.
+			if s.Code() == codes.NotFound {
+				return DynconfigData{
+					Scheduler:    getSchedulerResp,
+					Applications: nil,
+				}, nil
+			}
 		}
 
 		return nil, err