`addtask` recognises duplicate when task does not exist

[nus-se-script]

I am unable to add a task that clashes with any existing task. This may pose a problem, for example if I have an event from 11am to 3pm and I may need to run a quick errand from 11.30am to 12pm. I will not be able to add that into my timetable to track it.

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_{[original: nus-cs2113-AY2324S2/pe-interim#2560] [original labels: type.FeatureFlaw severity.High]}

[ZhuSijia0711]

Team's Response

This is what we purposely designed such that no 2 event happens concurrently.

Duplicate status (if any):

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