Description of problem:
Consistently getting the following errors in /var/log/horizon/horizon.log on a fresh VM running only openstack-dashboard from Mitaka repository in our deployment:
2016-05-03 08:46:40,423 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:40,807 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:40,809 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:40,809 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:40,809 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:40,810 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:43,063 16863 ERROR scss.compiler Mixin not found: dropdown-arrow:0 (themes/default/bootstrap/components/_dropdowns.scss:63 (themes/default/bootstrap/components/_dropdowns.scss:44))

We're using a local_settings carried over from Liberty. But also removing local_settings completely results in the above.

Version-Release number of selected component (if applicable):
openstack-dashboard-9.0.0-1.el7

How reproducible:
Permanently

Steps to Reproduce:
1. Install openstack-dashboard on empty VM
2. Rename /etc/openstack-dashboard/local_settings to something else
3. systemctl start httpd

Actual results:
"systemctl start httpd" fails.
Get the following errors in /var/log/horizon/horizon.log:
2016-05-03 08:46:40,423 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:40,807 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:40,809 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:40,809 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:40,809 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:40,810 16863 ERROR scss.ast Function not found: twbs-font-path:1
2016-05-03 08:46:43,063 16863 ERROR scss.compiler Mixin not found: dropdown-arrow:0 (themes/default/bootstrap/components/_dropdowns.scss:63 (themes/default/bootstrap/components/_dropdowns.scss:44))

These in turn appears to fail the httpd start completely, as it doesn't come up and logs:
May 03 10:46:44 openstack-dev-horizon3.srv.lab.cloud.ipnett.se systemd[1]: httpd.service: control process exited, code=exited status=1
May 03 10:46:44 openstack-dev-horizon3.srv.lab.cloud.ipnett.se systemd[1]: Failed to start The Apache HTTP Server.
May 03 10:46:44 openstack-dev-horizon3.srv.lab.cloud.ipnett.se systemd[1]: Unit httpd.service entered failed state.
May 03 10:46:44 openstack-dev-horizon3.srv.lab.cloud.ipnett.se systemd[1]: httpd.service failed.


Expected results:
Expect "systemctl start httpd" to succeed.
Without a local_settings file, do not expect horizon to start as it is not configured against anything -- however, do expect the SCSS compilations to succeed regardless of the local_settings.

Additional info: