[Suggestion] when there is no subjects in the list, for list all function #2779
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severity.VeryLow
status.Done
team.1
tutorial.CS2113T-W13
type.FunctionalityBug
when there is no item in the list, perhaps you could print a 'no subjects in list' message (like in the list function), instead of still printing the 'all-items' message without any items in the tree.
[original: nus-cs2113-AY2021S1/pe-interim#2744]
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