Bug: Edit command returns error when changing any fields

[jeronkk]

Description:

The edit command would return the below error when changing any fields.

This applicant already exists in the address book (Duplicate Email or Phone Number)

There is no duplicate data, which is why this error should not show up.

Steps to reproduce:

1. Enter this command into command box.

edit 1 n/Test Name

2. The output should show in the window with the above error message