better help message for list

[nus-se-bot]

If there are 0 contact in the list. They will still show as list 0 and the user might not know that they dont have any contact unless they use it often

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_{[original: nus-tic4002-AY2122s2/pe-interim#267] [original labels: type.FeatureFlaw severity.VeryLow]}

[zyjarvis]

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