Stuart Hayhurst 215282a320 osdWindow: Allow label and level to be null
Allow passing 'null' to setLevel and setLabel, so 'null' and 'undefined'
behave the same way.

Fixes a regression introduced by a42f7c23, which caused parts of old
notifications to persist into new notifications, or elements being
incorrectly made visible

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2917>
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