missing dependency "python-dockmanager"

Since "icontasks" is in 4.8-addons tha package needs a dependency on "python-dockmanager" because it can load dockmanager plugins. but it will show NO error if there is no python-dockmanager installed. it will just not work after install of some plugin.
for example http://kde-look.org/content/show.php/KMail%2BKontact+dockmanager?content=140632 (wich is a good plugin to get rid of the not working message-indicator :P

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: plasma-widgets-addons 4:4.7.95-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-7.13-generic-pae 3.2.0-rc7
Uname: Linux 3.2.0-7-generic-pae i686
ApportVersion: 1.90-0ubuntu1
Architecture: i386
Date: Fri Jan 6 16:44:50 2012
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
SourcePackage: kdeplasma-addons
UpgradeStatus: No upgrade log present (probably fresh install)