[fpc-pascal] gtree - Freeing a nil Root without error

[leledumbo]

Actually, I'm planning on redesigning gtree to be a part of larger ggraph
unit. As in the data structure theory, a tree is just a graph without cycle.
So I guess it should be made that way. There are a lot of graph and tree
variations though, so I think I need to take some time to design before
implementing. Besides, I'm a bit busy these days.



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