gistfile1.txt

root@salt:~# salt 'web01*' state.highstate
web01:
    Data failed to compile:
----------
    Rendering SLS 'base:web/nginx' 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 306, in render_jinja_tmpl
    output = template.render(**decoded_context)
  File "/usr/lib/python2.7/dist-packages/jinja2/environment.py", line 969, in render
    return self.environment.handle_exception(exc_info, True)
  File "/usr/lib/python2.7/dist-packages/jinja2/environment.py", line 742, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "<template>", line 7, in top-level template code
TypeError: 'NoneType' object is not iterable

; line 7

---
[...]
  pkg.installed: []
  service.running:
    - require:
      - pkg: nginx
    - watch:
      {% for hostname, data in pillar.get('web:sites') %}    <======================
      - file: /etc/nginx/sites-enabled/{{hostname}}
      {% endfor %}
{% for hostname, data in pillar.get('web:sites') %}
/etc/nginx/sites-enabled/{{hostname}}:
  file.managed:
[...]
---

gistfile2.txt

root@salt:~# salt '*' pillar.get web:sites
mongo01:
web01:
    ----------
    some.host.com:
        ----------
        location:
            http://localhost:3000
        ssl:
            True
        websockets:
            True