fix: only register/remove listeners when dependency is available

Author: KillStr3aK

Source2Framework.ChatService/Chat/ChatService.cs

@@ -20,9 +20,6 @@ public ChatService(ILogger<ChatService> logger, IPluginContext pluginContext) :
 
         public override void Initialize(bool hotReload)
         {
-            this.Plugin.AddCommandListener("say", this.OnSay);
-            this.Plugin.AddCommandListener("say_team", this.OnSayTeam);
-
             ChatPrefix = ((this.Plugin as ChatServicePlugin)!.Config.ChatPrefix);
         }
 
@@ -31,15 +28,34 @@ public override void OnServiceInitialized(IService service)
             if (service is ICommandService commandService)
             {
                 this.CommandService = commandService;
+
+                this.Plugin.AddCommandListener("say", this.OnSay);
+                this.Plugin.AddCommandListener("say_team", this.OnSayTeam);
             }
         }
 
-        public override void Shutdown(bool hotReload)
+        private void RemoveListeners()
         {
             this.Plugin.RemoveCommandListener("say", this.OnSay, HookMode.Pre);
             this.Plugin.RemoveCommandListener("say_team", this.OnSayTeam, HookMode.Pre);
         }
 
+        public override void OnServiceShutdown(IService service)
+        {
+            if (service is ICommandService)
+            {
+                this.RemoveListeners();
+            }
+        }
+
+        public override void Shutdown(bool hotReload)
+        {
+            if (this.CommandService == null)
+                return;
+
+            this.RemoveListeners();
+        }
+
         public void PrintToChat(CCSPlayerController player, string message)
         {
             player.CPrintToChat(message);