LoginAsync will return an FBResult instead of a nullptr

samples/LoginCpp-UWP/LoginCpp/MainPage.xaml.cpp

@@ -235,7 +235,7 @@ void MainPage::login_OnClicked(
 					TryRerequest(FALSE);
 				}));
 			}
-            else if (result != nullptr && result->Succeeded)
+            else if (result->Succeeded)
             {
                 // Got a token and all our permissions.
                 NavigateToOptionsPage();

winsdkfb/winsdkfb/winsdkfb.Shared/FacebookSession.cpp

@@ -1085,6 +1085,13 @@ IAsyncOperation<FBResult^>^ FBSession::LoginAsync(
                 _loggedIn = false;
                 AccessTokenData = nullptr;
             }
+            if (finalResult == nullptr)
+            {
+                finalResult = ref new FBResult(ref new FBError(0, L"Unexpected error", L"Log in attempt failed"));
+#ifdef DEBUG
+                OutputDebugString(L"LoginAsync was about to return nullptr, created FBResult object to return instead");
+#endif
+            }
 
             return finalResult;
         });