fix(preheat): handle nil payload during policy update

cmd/harbor/root/project/preheat/policy/update.go

@@ -83,6 +83,10 @@ func UpdatePolicyCommand() *cobra.Command {
 				return fmt.Errorf("failed to get preheat policy: %v", utils.ParseHarborErrorMsg(err))
 			}
 
+			if existingPolicy == nil || existingPolicy.Payload == nil {
+				return fmt.Errorf("preheat policy %s payload is empty", policyName)
+			}
+
 			log.Debug("Fetching available providers...")
 			providers, err := api.ListProvidersUnderProject(projectName)
 			if err != nil {

cmd/harbor/root/project/preheat/policy/update_test.go

@@ -0,0 +1,56 @@
+// Copyright Project Harbor Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package policy
+
+import (
+	"testing"
+
+	"github.com/goharbor/harbor-cli/pkg/testutil"
+)
+
+// TestUpdatePolicyCommand_Errors tests the custom CLI-level validations in the
+// update command. API responses are not tested here.
+func TestUpdatePolicyCommand_Errors(t *testing.T) {
+	tests := []struct {
+		name        string
+		flags       []string
+		expectError bool
+	}{
+		{
+			name:        "--id flag without arguments",
+			flags:       []string{"--id"},
+			expectError: true,
+		},
+		{
+			name:        "too many arguments",
+			flags:       []string{"project", "policy", "extra"},
+			expectError: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := testutil.TestCmd(t, UpdatePolicyCommand, tt.flags...)
+
+			if tt.expectError && err == nil {
+				t.Fatalf("expected error but got nil")
+			}
+
+			if !tt.expectError && err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+		})
+	}
+}