[Bug 44604] Exits with SIOCGIFFLAGS if selected interface no longer exists

[Paul Sladen]

Public bug reported:

GNOME Netstatus lives in the menu bar and presents an overview of the
network status.  Double-clicking on the menubar icon presents a dialogue
with a further option to launch 'network-admin' and configure a
selected, or multiple, network interfaces.

This dialogue does not appear if the last previously selected interface
is not available.  Instead an error message is displayed:

  SIOCGIFFLAGS error: No such device    [Close]

A screenshot of the error dialogue (top) and normal operation (bottom)
is:

  http://www.paul.sladen.org/ubuntu/bugs/network-monitor-no-such-
interface.png

The second screenshot was taken by doing a manual:

  $ sudo brctl addbr br1

to create the interface.

If 'gnome-netstatus' finds that the last previously selected interface
is not queriable, it should gracefully accept and than move onto the
next interface;  or (more easily) simply display an empty interface
text-entry box.

** Affects: gnome-netstatus (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

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Exits with SIOCGIFFLAGS if selected interface no longer exists
https://launchpad.net/bugs/44604