add check that kustomization is empty

api/internal/target/kusttarget.go

@@ -73,6 +73,11 @@ func (kt *KustTarget) Load() error {
 
 	k.FixKustomization()
 
+	// check that Kustomization is empty
+	if err := k.CheckEmpty(); err != nil {
+		return err
+	}
+
 	errs := k.EnforceFields()
 	if len(errs) > 0 {
 		return fmt.Errorf(

api/internal/target/kusttarget_test.go

@@ -79,6 +79,7 @@ func TestLoad(t *testing.T) {
 			k: types.Kustomization{
 				TypeMeta: expectedTypeMeta,
 			},
+			errContains: "kustomization.yaml is empty",
 		},
 		"nonsenseLatin": {
 			errContains: "found a tab character that violates indentation",