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notebook: fix gtk_widget_unparent() with NULL child

Christian Hergert requested to merge wip/chergert/fix-critical-notebook-label into master

When using gtk4-demo and closing the window (after changing notebook tabs), a CRITICAL like the following is presented.

gtk_widget_unparent: assertion 'GTK_IS_WIDGET (widget)' failed

This fixes that by conditionally checking that we have a valid widget still within the GtkBin.

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