As earlier stated, package was not installable because there were error in postinst. Reason for error was bug in py2deb, which was used for making deb.
Py2deb is now fixed [http://maemo.org/packages/view/python2.5-py2deb]

I fixed installation problem of harmattan-icons-pack-for-white-themes manually and pushed a new version (with some updated files by TransTech) to the extras-devel.