Comment 7 for bug 1285951

The current behavior is because it was by design, as per the old design document at <https://wiki.ubuntu.com/Bluetooth#Indicator_and_menu>: "When Bluetooth is on, the indicator icon should appear in the status bar. When Bluetooth is off, to save space the Bluetooth indicator should not be present at all."

Unless there is a better / more current document I should refer to, it looks like the latest available spec for the Bluetooth indicator is in https://docs.google.com/a/canonical.com/document/d/1OyHUg_uUfmhDNa-9UrMc1tZ_eH_99PEU_V2l1YFA1UY/edit# on page 17.