Blank/null response handling for the player-name prompt

[Craig5117]

Expected Behavior

If the prompt for the player's name is left blank or cancelled, a new prompt should request the player's name again.

Current Behavior

• If the prompt for the player's name is left blank, that answer is stored as the player's name
• If the player clicks cancel, player's name is stored as "null"

Possible Solution

• Create a function getPlayerName() that will loop until a valid response is entered.

[Craig5117]

Fixed the bug. It works as expected now.