Editor cold startup tweaks

It now works even if the SceneDataSO is not referenced

UOP1_Project/Assets/Prefabs/Gameplay/EditorInitializer.prefab

     m_SubObjectName: 
     m_SubObjectType: 
     m_EditorAssetChanged: 0
+  _onSceneReadyChannel: {fileID: 11400000, guid: b729e40fc41dd8b4ea7aaf5c857f7186,
+    type: 2}

UOP1_Project/Assets/Scripts/SceneManagement/EditorColdStartup.cs

 	[SerializeField] private GameSceneSO _thisSceneSO = default;
 	[SerializeField] private GameSceneSO _persistentManagersSO = default;
 	[SerializeField] private AssetReference _notifyColdStartupChannel = default;
+	[SerializeField] private VoidEventChannelSO _onSceneReadyChannel = default;
 
 	private void Start()
 	{
 
 	private void OnNotifyChannelLoaded(AsyncOperationHandle<LoadEventChannelSO> obj)
 	{
-		LoadEventChannelSO loadEventChannelSO = (LoadEventChannelSO)_notifyColdStartupChannel.Asset;
-		loadEventChannelSO.RaiseEvent(_thisSceneSO);
+		if(_thisSceneSO != null)
+		{
+			obj.Result.RaiseEvent(_thisSceneSO);
+		}
+		else
+		{
+			//Raise a fake scene ready event, so the player is spawned
+			_onSceneReadyChannel.RaiseEvent();
+			//When this happens, the player won't be able to move between scenes because the SceneLoader has no conception of which scene we are in
+		}
 	}
 #endif
 }

UOP1_Project/Assets/Scripts/SceneManagement/EditorColdStartup.cs.meta

   externalObjects: {}
   serializedVersion: 2
   defaultReferences:
-  - _onSceneReady: {fileID: 11400000, guid: b729e40fc41dd8b4ea7aaf5c857f7186, type: 2}
-  - _loadSceneEventChannel: {fileID: 11400000, guid: 00e3063edc5902e40832ea618644c597,
+  - _onSceneReadyChannel: {fileID: 11400000, guid: b729e40fc41dd8b4ea7aaf5c857f7186,
       type: 2}
   executionOrder: 0
   icon: {instanceID: 0}