Data failed to compile:
----------
    Rendering SLS 'base:packages.logcheck.config' failed: Jinja error: 'NoneType' object is not iterable
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/salt/utils/templates.py", line 366, in render_jinja_tmpl
    output = template.render(**decoded_context)
  File "/usr/lib/python2.7/dist-packages/jinja2/environment.py", line 894, in render
    return self.environment.handle_exception(exc_info, True)
  File "<template>", line 22, in top-level template code
TypeError: 'NoneType' object is not iterable

; line 22

---
[...]
        - append_if_not_found: True
        - show_changes: True
        - require:
            - pkg: logcheck
        - content: |
 {% for logfile in logfiles %}    <======================
            {{ logfile }}
 {% endfor %}

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/salt/utils/templates.py", line 366, in render_jinja_tmpl