Same emergency contact and patient's number are allowed

[maypfv]

When keying in the following command: add-patient n/John Doe ic/S1111222G g/M p/123 ec/123 e/johnd@example.com a/John street, block 123, #01-01 c/pneumothorax b/O+ t/Low, with the same phone number (123) as emergency contact number (123), the entry went through.
Refer to patient 13.

Note: Incorrect number of digits for phone number is addressed in Issues 6,7,8.

I believe this to be a feature flaw, as the patient should always put in a different emergency contact for their own safety in the future.