Create save file on editor cold startup if needed

UOP1_Project/Assets/Prefabs/Gameplay/EditorInitializer.prefab

     m_SubObjectName: 
     m_SubObjectType: 
     m_EditorAssetChanged: 0
+  _saveSystem: {fileID: 11400000, guid: edc355c4a7d5028408d322b90814e19e, 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 SaveSystem _saveSystem = default;
 
 	private void Start()
 	{
 		}
+		CreateSaveFileIfNotPresent();
 	}
 
 	private void LoadEventChannel(AsyncOperationHandle<SceneInstance> obj)
 	{
 		LoadEventChannelSO loadEventChannelSO = (LoadEventChannelSO)_notifyColdStartupChannel.Asset;
 		loadEventChannelSO.RaiseEvent(_thisSceneSO);
+	}
+
+	private void CreateSaveFileIfNotPresent()
+	{
+		if (_saveSystem != null && !_saveSystem.LoadSaveDataFromDisk())
+		{
+			_saveSystem.WriteEmptySaveFile();
+		}
 	}
 #endif
 }