Should user be able to scroll past end/beginning of list?

[wolverineks]

In the gif illustrating when to disable the scroll buttons, it appears that the scroll buttons are still enabled after Darth Vader has been fetched, but before Antinnis Tremayne is fetched.

It seems like the user could scroll past the beginning and end of the list.
Is this the expected behavior? Am I misinterpreting the directions?

What should the expected behavior be when:

• The last known sith (let's say, "Darth Vader") has an apprentice
• Their apprentice is the last apprentice ("Antinnis Tremayne")
• We know the apprentice's id (1330), but we dont know that they dont have an apprentice
• The user clicks the scroll down button before the last apprentice is retrieved