{%- macro include_optional(sls_file) %}
{%- if salt['file.file_exists']('{0}/files/{1}/{2}/init.sls'.format(opts['cachedir'], saltenv, sls_file)) or
salt['file.file_exists']('{0}/files/{1}/{2}.sls'.format(opts['cachedir'], saltenv, sls_file))
%}
- {{ sls_file }}
{% endif %}
{%- endmacro %}