[PE-D][Tester A] Edit command allows for duplicate emails to be used

[nus-pe-bot]

Running the following command edit 1 p/91234567 e/johnd@example.com causes me to receive the following output.

Which causes Alex Yeoh to have the same email as John Doe in the address book.

I feel like a check could be put in place to prevent duplicate emails from being used when editing another person's contact details!

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Labels: type.FeatureFlaw severity.Medium original: Haris-Irfan/ped#6

[travisim]

NOT_IN_SCOPE