Added event null check on BoolEventChannelSO

UOP1_Project/Assets/Scripts/Events/ScriptableObjects/BoolEventChannelSO.cs

 	public UnityAction<bool> OnEventRaised;
 	public void RaiseEvent(bool value)
 	{
-		OnEventRaised.Invoke(value);
+		if (OnEventRaised != null)
+			OnEventRaised.Invoke(value);
 	}
 }