[Bug 84858] lock screen panel button does nothing when screensaver not running

[Martin Pool]

Public bug reported:

I have a fairly new installation of feisty.

I just dragged the 'lock screen' button from the 'add to panel' window
onto a panel.  Clicking it does not lock the screen, though choosing
'properties' does show the screensaver preferences.

>From the command line I get

kapu% gnome-screensaver-command --lock
** Message: Screensaver is not running!

shouldn't the panel widget show an error or start the screensaver,
rather than dumb insolence?

** Affects: gnome-session (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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lock screen panel button does nothing when screensaver not running
https://launchpad.net/bugs/84858