Check whether the source file exists before configuring the dashboard
Check whether the source file exists before configuring the dashboard

Change-Id: If96f8d8b4f4c87724b73ed866c9ec6007b70371c
Closes-Bug: #1699083

rahulunair/kolla,stackforge/kolla,rahulunair/kolla,stackforge/kolla,openstack/kolla,stackforge/kolla,openstack/kolla