Cannot read property 'nativeElement' of undefined

### Issue type

**I'm submitting a ...** (check one with "x")

* [x] bug report
* [ ] feature request

### Issue description

**Current behavior:**

Console error in NbLayoutModule, on every page.

**Expected behavior:**

No errors.

**Steps to reproduce:**
Hard to tell, we don't use any html references to nativeElements in the code.

### Other information:

**npm, node, OS, Browser**
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**Angular, Nebular**
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