When deleting a group, if all words in the group are all part of another group, the list doesn't update until after you re-select it.

[nus-se-bot]

Group weather is deleted, but still present in table.

Will only update after selecting the tab.

Works fine if at least 1 of the word only contains the deleted group.

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Reported by: @KokJianYu
Severity: Low

_{[original: nus-cs2103-AY1819S1/pe-dry-run#202]}