nb-list is not accepting ng-container

**I'm submitting a bug report

* [x] bug report
* [ ] feature request

### Issue description

**Current behavior:**
nb-list is not supporting any wrapper around it. I’m trying to have more than one structural directive on the same element.

`


 {{ card.name }}


`

**Expected behavior:**
The system should allow wrapper around nb-list and render ng-container or ng-template. I even tried editing NgComponentSelectors in list.component.d.ts to support all wrapper.

`static ɵcmp: ɵngcc0.ɵɵComponentDefWithMeta;`