Error message for delete 0 is not vaild

[nus-se-script]

Error message for delete 0 should be same as error message for wrong index. But "Invalid command format!" is shown although the format is correct.

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_{[original: nus-cs2103-AY2324S2/pe-interim#5573] [original labels: type.FunctionalityBug severity.Low]}

[ziiqii]

Team's Response

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Duplicate status (if any):

Duplicate of #5581