[Notes Delete Command] Lack of Error Message when Deleting Note from Contact Without Notes

[elliot-tang]

Actual Output

When removing a note from a contact without notes, a success message is shown: "Deleted notes for NAME".

Expected Output

An error message to be shown, stating that the contact did not have any notes to begin with. To me, this would make it clearer to the user and avoid potential confusion with the command!

Steps to Reproduce

Command sequence:

1. clear
2. add n/John Doe p/98765432 e/johnd@example.com a/311, Clementi Ave 2, #02-25 i/low age/50 t/client t/owesMoney
3. notes del/1

Screenshots

[nus-pe-script]

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