From 9da3377aa77ecb8c0225994764a8f214691c7ec4 Mon Sep 17 00:00:00 2001
From: Christian Kratky <christian.kratky@googlemail.com>
Date: Wed, 24 Apr 2019 20:19:55 +0200
Subject: [PATCH] Fix credential generation.

---
 .../MainPage.xaml.cs                                | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/Tests/MQTTnet.TestApp.UniversalWindows/MainPage.xaml.cs b/Tests/MQTTnet.TestApp.UniversalWindows/MainPage.xaml.cs
index 4623f66e..b2494c4d 100644
--- a/Tests/MQTTnet.TestApp.UniversalWindows/MainPage.xaml.cs
+++ b/Tests/MQTTnet.TestApp.UniversalWindows/MainPage.xaml.cs
@@ -119,12 +119,15 @@ namespace MQTTnet.TestApp.UniversalWindows
                 throw new InvalidOperationException();
             }
 
-            options.Credentials = new MqttClientCredentials
+            if (!string.IsNullOrEmpty(User.Text))
             {
-                Username = User.Text,
-                Password = Password.Text
-            };
-
+                options.Credentials = new MqttClientCredentials
+                {
+                    Username = User.Text,
+                    Password = Password.Text
+                };
+            }
+            
             options.CleanSession = CleanSession.IsChecked == true;
             options.KeepAlivePeriod = TimeSpan.FromSeconds(double.Parse(KeepAliveInterval.Text));