Comment 9 for bug 1470080

Matthew, I don't know, I've just suggested it as a possible workaround or whatever it might be called.

I've reported my problem here: https://bugs.launchpad.net/bugs/1556622 which was marked as duplicate of this bug report, and I can confirm that the problem I've first seen with iPad is the same as iPhone.
The "missing icon" image in the indicator appears only when any such Apple device is being charged.
If it's fully charged it only appears in the power menu, and in both cases - as far as I can see - its menu item simply has no icon instead of a "missing icon" image as can be seen in my screenshot there.

I could even suggest having the same behavior as other devices such as a Kindle or an Android mobile phone, which are not shown anywhere in the power indicator - neithe in the indicator or its menu - as they show their own power status anyway.