Inconsistent remove all message

[nus-se-bot]

When food does not exist, writing "delete f/all" displays "All food items have been removed". Such message is not found in other delete commands where it rightfully detects no item exists

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_{[original: nus-cs2113-AY2122S1/pe-interim#2879] [original labels: severity.Low type.FunctionalityBug]}

[tlyi]

Team's Response

It is true that we should have made the message more consistent, but this does not affect the functionality of the app at all, and does not bring any inconvenience to the user either.

Duplicate status (if any):

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