Make this a sucessful login even though they have no start nodes - so our SPA app can decide in the UI what to do/show

src/Umbraco.Web/Security/BackOfficeSignInManager.cs

@@ -121,7 +121,9 @@ namespace Umbraco.Web.Security
                     {
                         _logger.WriteCore(TraceEventType.Information, 0,
                             $"Login attempt failed for username {userName} from IP address {_request.RemoteIpAddress}, no content and/or media start nodes could be found for any of the user's groups", null, null);
-                        return SignInStatus.Failure;
+
+                        // We will say its a sucessful login which it is, but they have no node access
+                        return SignInStatus.Success;
                     }
                 }