But it does nothing, harms nooone so why not

• "Hmm, have to make blah call foo somewhere. I'll just throw it in at the end, before the return."
• "WTF?! Why isn't foo getting called?"
• "F&@%$&*@!!"

The extra return is misleading.

On the other hand, this example does demonstrate another good defensive programming practice: always always ALWAYS put a default else on your conditionals, even (especially) if that condition "can't happen".