[PATCH] applets/systemmonitor: handle null faceController

[PATCH] applets/systemmonitor: handle null faceController

When initially adding a systemmonitor widget to a panel, faceController
can still be null, causing several TypeErrors.

Instead, use optional chaining and default values to prevent these
errors until the faceController is loaded.

Gbp-Pq: Name upstream_d4df9b5f_applets-systemmonitor-handle-null-faceController.patch