Program writes to data file even upon invalid action

[nus-se-script]

Program writes the timetable to data file even though an invalid index is given as stated. Though, in this case, not too major as no change will take place. It is just not expected for users to see.

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_{[original: nus-cs2113-AY2324S2/pe-interim#2562] [original labels: type.FunctionalityBug severity.VeryLow]}

[Leong-ZM]

Team's Response

No details provided by team.

Duplicate status (if any):

Duplicate of #730