[BUG] failure seen on FreeBSD 13

[noelmcloughlin]

Your setup

Formula commit hash / release tag

vagrant box roboxes/freebsd11

Versions reports (master & minion)

[vagrant@bazinga ~]$ salt --versions-report
Salt Version:
           Salt: 2019.2.3
 
Dependency Versions:
           cffi: 1.14.0
       cherrypy: Not Installed
       dateutil: Not Installed
      docker-py: Not Installed
          gitdb: Not Installed
      gitpython: Not Installed
          ioflo: Not Installed
         Jinja2: 2.10.1
        libgit2: Not Installed
        libnacl: Not Installed
       M2Crypto: Not Installed
           Mako: Not Installed
   msgpack-pure: Not Installed
 msgpack-python: 0.6.2
   mysql-python: Not Installed
      pycparser: 2.19
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 2.7.17 (default, Mar 21 2020, 01:18:34)
   python-gnupg: Not Installed
         PyYAML: 5.2
          PyZMQ: 18.1.1
           RAET: Not Installed
          smmap: Not Installed
        timelib: Not Installed
        Tornado: 4.5.3
            ZMQ: 4.3.1
 
System Versions:
           dist:   
         locale: US-ASCII
        machine: amd64
        release: 11.3-RELEASE
         system: FreeBSD
        version: Not Installed

Pillar / config used

---

Bug details

Describe the bug

[ERROR   ] Rendering exception occurred
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/salt/utils/templates.py", line 169, in render_tmpl
    output = render_str(tmplstr, context, tmplpath)
  File "/usr/local/lib/python2.7/site-packages/salt/utils/templates.py", line 404, in render_jinja_tmpl
    buf=tmplstr)
SaltRenderError: Jinja variable 'None' has no attribute 'server'
[CRITICAL] Rendering SLS 'base:memcached' failed: Jinja variable 'None' has no attribute 'server'
local:
    Data failed to compile:
----------
    Rendering SLS 'base:memcached' failed: Jinja variable 'None' has no attribute 'server'

Steps to reproduce the bug

Expected behaviour

Attempts to fix the bug

Additional context