message: disable sc dropdown until sc loaded
diff: @@ -531,7 +531,7 @@ export const DiskModal = withHandlePromise((props: DiskModalProps) => {
  <K8sResourceSelectRow
  key="storage-class"
  id={asId('storage-class')}
  - isDisabled={isDisabled('storageClass')}
  + isDisabled={isDisabled('storageClass') || !isLoaded(storageClasses)}
  name={storageClassName}
  data={storageClasses}
  model={StorageClassModel}
  