result.getRedirect() after Logout returns undefined

As #567 is closed, I open a new thread with the same issue:

The logout redirect does not work in my project, too. result.getRedirect() returns undefined (result is NbAuthResult). Where can I configure the logout redirect? Using the redirectUri config in forms/logout does not work. Neither does the configuration of a logout redirect uri in the Azure AD App registration (I'm using OAuth2 with Azure AD).

### Issue type

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

* [x ] bug report
* [ ] feature request

### Issue description

**Current behavior:**
redirect after logout: result.getRedirect() returns undefined

**Expected behavior:**
not sure where the redirect url should be defined

**Steps to reproduce:**

**Related code:**
see #567

### Other information:

**npm, node, OS, Browser**
node: 12.6.0
npm: 6.11.3
OS: Windows 10
Browser: Chrome

**Angular, Nebular**
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"@angular/compiler": "^8.0.0",
"@angular/core": "^8.0.0",
"@angular/forms": "^8.0.0",
"@angular/platform-browser": "^8.0.0",
"@angular/platform-browser-dynamic": "^8.0.0",
"@angular/router": "^8.0.0",
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