Tree table loading icon and empty message on branch open.


I'm using a tree table, and on open of a branch, I fetch the children using a custom implementation.
1) I want to show a loading icon in the expanded area while fetching the data.
2) After fetching the data, there might be a case where the parent might not have any children. In such a scenario I want to show a message conveying that there are no children for the parent, in the expanded area.



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