Fixed: mqtt crash if no user or password defined

Changed: UserInterface.exe removed from hass-workstation due it is not updated on changes and use old state of sensors

hass-workstation-service/Data/ConfiguredMqttBroker.cs

@@ -5,8 +5,30 @@ namespace hass_workstation_service.Data
 {
     public class ConfiguredMqttBroker
     {
+        private string username;
+        private string password;
         public string Host { get; set; }
-        public string Username { get; set; }
-        public string Password { get; set; }
+
+        public string Username
+        {
+            get
+            {
+                if (username != null) return username;
+                
+                return "";
+            }
+            set => username = value;
+        }
+
+        public string Password
+        {
+            get
+            {
+                if (password != null) return password;
+                
+                return "";
+            }
+            set => password = value;
+        }
     }
 }

hass-workstation-service/hass-workstation-service.csproj

@@ -28,12 +28,6 @@
     <None Remove="UserInterface.pdb" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Content Include="UserInterface.exe">
-      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
-    </Content>
-  </ItemGroup>
-
   <ItemGroup>
     <None Include="appsettings.json">
       <CopyToOutputDirectory>Never</CopyToOutputDirectory>