disper-indicator shows only dummy monitor and manage application errors out

[John Gruber]

This is a bug in disper-indicator.

disper 0.3.0
disper-indicator 0.4.13
Ubuntu 12.04 Beta 2

disper-indicator worked under 11.04, but my upgrade to 12.04 Beta 2 for testing broker disper-indicator.

Running disper -l on my machine returns:

$disper -l
display DFP-0: AUO
 resolutions: 320x175, 320x200, 360x200, 320x240, 400x300, 416x312, 512x384, 640x350, 576x432, 640x400, 680x384, 720x400, 640x480, 720x450, 640x512, 700x525, 800x512, 840x525, 800x600, 960x540, 832x624, 960x600, 896x672, 928x696, 1024x768, 1152x864, 1360x768, 1440x900, 1600x900
display DFP-2: HP 2159
 resolutions: 320x175, 320x200, 360x200, 320x240, 400x300, 416x312, 512x384, 640x350, 576x432, 640x400, 680x384, 720x400, 640x480, 720x450, 640x512, 700x525, 800x512, 840x525, 800x600, 960x540, 832x624, 960x600, 896x672, 928x696, 960x720, 1024x768, 1152x864, 1360x768, 1280x960, 1440x900, 1280x1024, 1400x1050, 1600x1024, 1680x1050, 1600x1200, 1920x1080

showing my two monitors. When I launch disper-indicator from a terminal I see:

$disper-indicator
(II) Starting indicator-version

My indicator icon shows up, but on the top menu I see only the 'dummy' monitor.

When I choose the 'manage application' menu item I get the following error on my console:

File "/usr/lib/disper-indicator/application_interface.py", line 225, in _getIconPath
    icon_info = icon_theme.lookup_icon(p_sIconName, ICON_PREFERRED_SIZE, 0)
TypeError: Gtk.IconTheme.lookup_icon() argument 1 must be string, not None

Thank you for your review.