Fix when collider is empty

scenes/levels/levels.gd

@@ -157,6 +157,7 @@ func _physics_process(_delta):
 		var result = space_state.intersect_ray(from, to, [], 1, false, true)
 		from = null
 		to = null
+		if result.has("collider"):
 			var node = result["collider"].get_parent()
 			if node != null:
 				_start_dissolve(node.name)