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lab2: Allow running display-functions on empty tree

Simon Sundberg requested to merge simosund/dvgb03:lab2_ui_remove_empty_check into master

Remove early return from display_tree in ui.py. This means the UI will now attempt to run size, height, inorder, preorder, postorder och bfs_order_star for empty trees as well. This should make it easier for students to test and discover issues with how these functions handle empty trees.

Signed-off-by: Simon Sundberg simon.sundberg@kau.se

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