Fix setting up mailing units. (#16890)

* Fix disposal unit config

* Remove redundant ui update

Content.Client/Configurable/UI/ConfigurationMenu.cs

@@ -92,7 +92,7 @@ namespace Content.Client.Configurable.UI
                 var input = new LineEdit
                 {
                     Name = field.Key + "-input",
-                    Text = field.Value,
+                    Text = field.Value ?? "",
                     IsValid = Validate,
                     HorizontalExpand = true,
                     SizeFlagsStretchRatio = .8f

Content.Shared/Configurable/ConfigurationComponent.cs

@@ -10,7 +10,7 @@ namespace Content.Shared.Configurable
     public sealed class ConfigurationComponent : Component
     {
         [DataField("config")]
-        public readonly Dictionary<string, string> Config = new();
+        public readonly Dictionary<string, string?> Config = new();
 
         [DataField("qualityNeeded", customTypeSerializer: typeof(PrototypeIdSerializer<ToolQualityPrototype>))]
         public string QualityNeeded = "Pulsing";
@@ -21,9 +21,9 @@ namespace Content.Shared.Configurable
         [Serializable, NetSerializable]
         public sealed class ConfigurationBoundUserInterfaceState : BoundUserInterfaceState
         {
-            public Dictionary<string, string> Config { get; }
+            public Dictionary<string, string?> Config { get; }
 
-            public ConfigurationBoundUserInterfaceState(Dictionary<string, string> config)
+            public ConfigurationBoundUserInterfaceState(Dictionary<string, string?> config)
             {
                 Config = config;
             }

Resources/Prototypes/Entities/Structures/Piping/Disposal/units.yml

@@ -135,6 +135,8 @@
     transmitFrequencyId: MailingUnit
   - type: WiredNetworkConnection
   - type: Configuration
+    config:
+      tag:
   - type: Appearance
   - type: UserInterface
     interfaces: