misc: full null game objects in GleUnits

Author: jsm174

Runtime/Gamelogic/VisualScriptingGamelogicEngine.cs

@@ -61,7 +61,7 @@ public void OnInit(Player player, TableApi tableApi, BallManager ballManager)
 			_player = player;
 			BallManager = ballManager;
 
-			OnStarted?.Invoke(this, EventArgs.Empty);
+			EventBus.Trigger(VisualScriptingEventNames.GleStartedEvent, EventArgs.Empty);
 		}
 
 		public void Switch(string id, bool isClosed)

Runtime/Nodes/GleUnit.cs

@@ -35,10 +35,10 @@ public abstract class GleUnit : Unit, IGleUnit
 
 		[DoNotSerialize]
 		protected Player Player;
-
+		
 		protected bool AssertGle(Flow flow)
 		{
-			if (Gle != null) {
+			if (!UnityObjectUtility.IsUnityNull(Gle)) {
 				return true;
 			}
 			Gle = flow.stack.gameObject.GetComponentInParent<IGamelogicEngine>();
@@ -47,7 +47,7 @@ protected bool AssertGle(Flow flow)
 
 		protected bool AssertPlayer(Flow flow)
 		{
-			if (Player != null) {
+			if (!UnityObjectUtility.IsUnityNull(Player)) {
 				return true;
 			}
 			Player = flow.stack.gameObject.GetComponentInParent<Player>();