Fix Editor crash when MeshLibrary gets replaced while used in an open Scene #67141
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Fixes #64393
Some functions are intended to be called inside the SceneTree so get_global_transform() and get_world() can work but this is not always the case when the scene is loaded in e.g. an Editor background tab. The MeshLibrary replacement is triggering a lot of them and while transform fails only polluted the error log the call to get_world() was a fatal error that crashed the Editor.
In Godot 4.x this is already guarded / handled slightly differently.