openstack-dashboard-ubuntu-theme fails to install

[Impact]

Users won't be able to install openstack-dashboard on vivid.

Setting up openstack-dashboard-ubuntu-theme (1:2015.1~b2-0ubuntu2) ...
Collecting and compressing static assets...
CommandError: An error occured during rendering /usr/share/openstack-dashboard-ubuntu-theme/templates/_stylesheets.html: 'dashboard/css/rickshaw.css' could not be found in the COMPRESS_ROOT '/usr/share/openstack-dashboard/static' or with staticfiles.
dpkg: error processing package openstack-dashboard-ubuntu-theme (--configure):

ubuntu@controller:~$ ls /usr/share/openstack-dashboard/static/dashboard/css/
f7e146208cbd.css

[Test Case]
Install vivid, run:
sudo apt-get install openstack-dashboard apache2 libapache2-mod-wsgi

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: openstack-dashboard-ubuntu-theme 1:2015.1~b2-0ubuntu2
ProcVersionSignature: User Name 3.18.0-13.14-generic 3.18.5
Uname: Linux 3.18.0-13-generic x86_64
ApportVersion: 2.16.1-0ubuntu2
Architecture: amd64
Date: Fri Feb 20 19:29:29 2015
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: horizon
UpgradeStatus: No upgrade log present (probably fresh install)