perf: BehaviourController.GetBehaviours now uses Linq.Enumerable.Empty if None Found

Engine.Core/BehaviourController.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
+using System.Linq;
 
 using Syntriax.Engine.Core.Abstract;
 
@@ -55,17 +56,17 @@ public class BehaviourController : IBehaviourController
 
     public IList<T> GetBehaviours<T>()
     {
-        IList<T> behaviours = new List<T>();
+        List<T>? behaviours = null;
         foreach (var behaviourItem in this.behaviours)
         {
             if (behaviourItem is not T behaviour)
                 continue;
 
-            behaviours ??= new List<T>();
+            behaviours ??= [];
             behaviours.Add(behaviour);
         }
 
-        return behaviours;
+        return behaviours ?? Enumerable.Empty<T>().ToList();
     }
 
     public void RemoveBehaviour<T>(bool removeAll = false) where T : class, IBehaviour