fall back to result type if no explicit browser result has been set

Author: leastprivilege

src/AuthorizeClient.cs

@@ -68,7 +68,7 @@ public async Task<AuthorizeResult> AuthorizeAsync(AuthorizeRequest request, Canc
                 return result;
             }
 
-            result.Error = browserResult.Error;
+            result.Error = browserResult.Error ?? browserResult.ResultType.ToString();
             return result;
         }