[Satellite 6] Provisioning a new host fails with "undefined method `path' for nil:NilClass" error

Issue

• Provisioning a discovered host from Red Hat Satellite 6 fails with following error message,

[W] Fetch TFTP boot files for client.example.com task failed with the following error: undefined method `path' for nil:NilClass

Other scenario is provisioning a new host or clicking Build button errors out with:

 Failure parsing template-name: undefined method `path' for nil:NilClass.