(WindowImp::poll) : Fix a bug to make sure dump the render tree even if it is empty; cf. html4/root-box-003 (WindowImp::mouse, WindowImp::mouseMove, WindowImp::elementFromPoint) : Add checks for the empty render tree.
(WindowImp::poll) : Fix a bug to make sure dump the render tree even if it is empty; cf. html4/root-box-003
(WindowImp::mouse, WindowImp::mouseMove, WindowImp::elementFromPoint) : Add checks for the empty render tree.

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