Error browser can't be closed about slicerjupyter HOT 2 OPEN

We don't use a window manager in the slicer-notebook docker image, to keep the GUI simple (don't show window controls inside notebooks). I guess this is just an unlucky situation that currently cannot be resolved using the GUI. However, you can easily hide the error window by typing this command:

slicer.util.mainWindow().errorLogWidget().hide()

This is useful feedback, maybe we'll disable or hide the button in the slicer-notebook image.

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The command worked. I would vote for keeping it otherwise how else users would be able to see errors? We can keep this instruction somewhere so the user knows how to close the dialog box after invoking.

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