firmware-security: Hide the panel when chassis type is an empty string

Kate Hsuan requested to merge wip/kate/empty-string-as-vm into main

When requesting the chassis type through systemd-hostnamed, it sometimes returns an empty string "" not the "vm" to present the virtual machine. Since this panel will not be shown in the VM environment, if systemd-hostnamed returns an empty string or "vm", the panel will be hidden.

Fixes: #2016 (closed)

Signed-off-by: Kate Hsuan

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