Tele handle is compulsory when adding a student, but some students may not use Telegram

[nus-se-bot]

When adding a student, it is compulsory to add a telegram handle. While it is true that most NUS students use telegram to communicate with TAs, it is possible that a student does not use telegram frequently, or does not have telegram at all in rare cases, and instead mainly uses other apps such as Microsoft teams, whatsapp etc. to communicate with TA.

Given that many alternative apps exist, and the possibility of students not (mainly) using telegram also exists, perhaps a tele handle field should not be compulsory when adding students, as it may cause the following problem:

For example, if a student does not have telegram at all, I need to put some placeholder like 00000 in his/her tele handle. However, all tele handles must be unique for students in the same mod, so I need to put different placeholders for every student not using telegram. This is inconvenient and may cause confusion.

Suggestion: Make tele handle optional, or making this field accept handles of other apps (if applicable).

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_{[original: nus-cs2103-AY2122S1/pe-interim#5184] [original labels: severity.Low type.FeatureFlaw]}

[tanjoewel]

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