[Bug 36179] Choosing icon does not present error box upon failure to load.

[Keith Kyzivat]

Public bug reported:
https://launchpad.net/malone/bugs/36179

Affects: control-center gnome-control-center (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
Found in: Dapper Drake LiveCD - Flight 5

Upon choosing an invalid icon file for your user in gnome-about-me, no
feedback is given that there was a failure.  It merely returns to the
main gnome-about-me panel, with the original icon intact.

There should be feedback when there is a failure to load icons, and the
icon chooser should give indication as to the types of files that it can
load.  For instance, an SVG cannot be used for the badge.