Remove unnecessary dot
Remove unnecessary dot

This patch removes unnecessary dot from exception message
on policies index view.

Change-Id: Id572735f5df67b24dbb551c74e51927cdd2fd7e0

openstack/senlin-dashboard,stackforge/senlin-dashboard,openstack/senlin-dashboard,openstack/senlin-dashboard,stackforge/senlin-dashboard,openstack/senlin-dashboard,stackforge/senlin-dashboard