When using the add command to add a new person into the AddressBook, the GUI does not reflect the newly added person.
Steps to recreate bug:
Launch app
Enter a valid add command
GUI does not show added person
Expected behaviour: The GUI should reflect the addtion of a new person after add command is called.

When using the add command to add a new person into the AddressBook, the GUI does not reflect the newly added person.
Steps to recreate bug:
Launch app
Enter a valid add command
GUI does not show added person
Expected behaviour: The GUI should reflect the addtion of a new person after add command is called.