Check that the Chest Lid Exists First

To handle the possibility that chestLid could be null, we’ll use an if-statement to only run the next line if it does, in fact, exist. To do this, we need the NOT-EQUALS operator, !=. 

1. Before the chestLid sendEvent line, add an if statement.
2. Move the final } curly bracket to be after the chestLid sendEvent line.
3. Make the condition of the if-statement that the chestLid does not equal null
4. Indent the chestLid sendEvent line.