Tested on develop (eefbf33f), clicking "Build PXE Default" under Provisioning Templates results in the following error:

failed to process template: exp not empty after Safemode::Parser.process_call on s(s(:call, s(:lvar, :profile), :[], s(:lit, :hostgroup))) from s(:call, nil, :default_template_url, s(:call, s(:lvar, :profile), :[], s(:lit, :template)), s(:call, s(:lvar, :profile), :[], s(:lit, :hostgroup)))